the leaders of libya's new unity government return to tripoli but they face a fight for acceptance hello. this is al jazeera live from doha. also ahead, the u.s. is sending tore troops and tanks to eastern europe in response to what it calls russian aggression. people of the world's largest refugee camp say they feel caught between the kenyan government and al-shabab. the world's large e mangrove rain forest is under threat and calls to protect it are going

unansweree unanswered the leaders of libya's new u.n. backed unity government have returned to the capital. they face a significant challenge to restore stability with different factions continuing to back rival administrations. our correspondent reports. >> reporter: defying threats by rival factions, the head of the libya's u.n. backed government of national accord arrived in tripoli by sea to take up his position >> translation: we were eager there was no bloodshed. we will expand the participants in the agreement >> reporter: he wasn't welcomed by everyone. gunfire was heard shortly after unity government members arrived. >> translation: the government of national salvation calls on those illegitimate infiltrators

to hand over themselves or be in safe hands or to come back to where they came from. the government is working with entities all state institutions and ngos as well as community leaders to take the necessary steps to save the country from the threat of chaos and foreign intervention. >> reporter: this man had previously been based in tunisia. whether he will be able to establish any kind of authority within libya remains unclear. >> the problem is that the government of the national salvation is not unified. it is divided anyway and there's another government too that in the east, in tobruk and that is divided as well >> reporter: the unity government formed under a u.n. peace deal last year aimed to end the chaos that has existed in libya since the uprising five years ago. it has the backing of a key

militia but there are more obstacles in the way. islamic state in iraq and the levant have taken advantage of the political vacuum that has existed for year and have managed to find a foot hold in the oil-rich region. aside from i.s.i.l. libya is home to thousands of fighters belonging to several powerful armed groups which adds to the challenges the unity government would have to address to bring order to the conflict ravaged country al jazeera's correspondent is in tripoli and says the dynamic in the capital is unpredictable >> to begin with, the position of the council has finally reached the capital and its new headquarters here in the navy base here in tripoli. that is a big step ahead, but on the other hand each political

institution here either with the government, the new government, or against the new government, each political institution, they have their own military arm on the ground. like what happened today, we heard a shooting in the streets from brigade $who are opposing the government of national accord, but we recently heard that negotiations and talks are on to appease those brigades that are opposing the government of national aaccord. other than that it is very unpredictable going to a libyan political analyst, he says the political situation is unprecedented. >> for now we have three governments that are operating out of libya or somewhere out of libya. what happens next is or what is supposed to happen next is that both of the other government $will hand to this

international-- governments will hand over power peacefully, but that does not look like an option at the moment and as a result what we will end up with is instead of having two competing governments, we will have three competing governments in libya because the government or the self-proclaimed islamist government in tripoli is refusing to hand over power and is going as far as actually threatening war and resistance against this u.n.-backed government, and in eastern libya the other caretaker government prime minister has refused to hand over power because he says this u.n.-backed government was not endorsed by the parliament in the city of tobruk in eastern libya and he would not hand over until it is given that endorsement from the recognised parliament the u.s. is sending for troops and more tanks to eastern europe.

the senior u.s. demander in europe described it as a necessary response to an aggressive russia. germany is likely to host the bulk of the contingent with a the u.s. establishing a presence i do nots the six bloc countries. >> it is basically the first deployment of person ground forces near the russian frontier since the end of the cold war. the russian ambassador to nato responded immediately. he said that russia would not be a passive observer to this. russia has long contended that this kind of deployment was a violation of the 1997 treaty between russia and nato when it expanded its membership, but he said that russia would choose to respond asim mettically. it is not sure what they

immediate. it is aborigine attempt to add ukraine and georgia to its membership would be met with severe consequences from russia here is a look at what this announcement means. in 2013 u.s. withdrew all tanks from europe but within months that decision was reversed and a training contingent of 22 tanks was returned to germany. that will now be increased to more than tenfold to 2050. -- 250. more troops rising from 25,000 to nearly 30,000. a former u.s. ambassador to nato says the u.s. move will offer reassurance to u.s. allies in heern europe who may be nervous about russia's intentions. >> they're very concerned. they've been watching over the past several years. in 2008 russia invaded georgia. it still occupies two of the territories there and has recognised them as independent states t invaded ukraine, it has

annexed part of that territory and supported separatists in eastern ukraine. it very longly violates the air and sea states of native allies. it has threatened military attack, including nuclear attack against warsaw or against danish ships and countries in the eastern part of the alliance, particularly the baltic states, romania, bullbaria and poland are concerned about the russian behaviour. it is clear that nato made clear that it maintains the political will and the military capability to fulfil its collective defense obligations as long as that is true and visible, then we can continue to deter any russian aggression in the future. i think that, if anything, it's going to cause russia to be a little bit more cautious in some of its approaches toward eastern allies and europe, and i think it will understand and respect that the u.s. is taking a clear position consistent with its longstanding treaty obligations

of collect i defense. -- collective defense. i believe what we have seen is russia taking advantage of the u.s. and nato. they have done everything possible to accommodate russia. what russia has done is go further and further from georgia to ukraine and more. what i think we're going to see is more push back, perhaps, you could call it that, a little bit more persistence from nato, and i think that will help disablise things a little bit rather than seeing this creeping russian - i wouldn't call it aggression necessarily in the case of nato, but creeping assertiveness which has continued because we have not responded world leaders have begun to arrive in u.s. for a summit on nuclear security. more than 50 countries are attending this summit in washington. they will discuss ways of limiting nuclear war and how to safely secure nuclear materials.

russia hasn't attended the talks. it is said that it is a missed opportunity by the u.s. >> reporter: this man flew to washington in 2010 to take part in the first ever nuclear security summit. he and hi host, u.s. president obama, agreed the time was now to keep nuclear materials away from the bad guys. >> translation: this is not about economy or global crisis. this topic is crucial to every state and it is a really threat and challenge for all of us. >> reporter: but miss successor, vladimir putin, won't be joining-- his successor, won't be joining obama in march. it is a decision made at the end of 2014 >> we hope russia shares the view that materials remains a

priority of world leaders. >> reporter: after the cold war russia and the u.s. worked to secure nuclear material in the former soviet nations as well as within russia, but russian security services long suspected the security program was a spying initiative in disguise and putin suspected the obama administration was more interested in undercutting him >> we've seen a lot of cooperation between russia and the u.s. over the last few years over nonproliferation procedures. the russians have been central to the uranium central deal and the process there. i think they have this broader scepticism of u.s. led national initiatives and particularly international substitutions that might lead to a step back >> reporter: also at issue the u.s. sanctions in response to russia's annexation of crimea.

>> if an act of nuclear terrorism was to take place anywhere in the world, the entire international community would be affected by the environmental fallout, by the financial consequences and certainly by the catastrophic loss of life. >> reporter: the russians are sticking by their decision saying the nuclear security summit has come to the end of its usefulness still to come here on al jazeera, colombia a step closer to ending a 50-year conflict. we will tell you why. plus, brazil's embattled presidential is accusing a plot against her. against her.

welcome back. a moment to remind you rft top stories. the-- of the top stories. the prime minister says that he wants to achieve national reconciliation but gunfire was heard after they arrived. tripoli's self declared government and armed groups that back it say the entry of the u.n. backed government is illegal. the u.s. is sending more troops and tanks to eastern europe. the senior u.s. commander in europe described it as a necessary response to an aggressive russia. germany ask likely to host the bumming of the contingent. world leaders have begun arriving in u.s. for a summit on nuclear security. they will discuss ways to limit the threat of nuclear war and

how to safely secure nuclear materials, but russia isn't attending those talks and that's drawn criticism in the u.s. in colombia the government and the second biggest rebel group have announced the beginning of formal peace talks. the eln will follow on from the farc and following on with talks to end 50 years of civil conflict. >> reporter: it was the missing piece in colombia's quest to end a 50 year old civil conflict. finally the second biggest rebel group agreed to start negotiations with the government. >> translation: they have agreed to open a public negotiating table to address the points on the agenda in order to reach a final agreement to end the armed conflict and agree to transformations in search of a peaceful and equitable colombia. >> reporter: the announcement was made in the capital where

the sides have been meeting in talks since 2014. under the deem the public negotiations will take place in ecuador and some sessions will be held in brazil, chile, cuba and venezuela. >> translation: the action plan will involve mechanisms of control monitoring and verification that will include the participation of society, the international community, the government and the national liberation army. >> reporter: the two sides agreed to a broad six point aagenda that will deal with peace construction and the right to victims. the focus will be on public participation to define the most needed reforms in the regions affected by the conflict. some points will converge with the ongoing peace talks between the government and the biggest rebels group, the farc, that have been underway and are in their final stretch. the eln is a much smaller group

than the farc. many analysts feared that a peace agreement without the eln would have been fragile. in a speech, the president said that bringing eln to the negotiating table was paramount. >> translation: it will be the end of gurilla groups and we request skralt on making the country the free and inclusive place it should be. >> reporter: at this point it is unclear when the negotiations will begin in earnest. the government wants the eln to release any hostage they're still holding before agreeing to a date. what is clear, though, is that this announcement means the country took another important step to a definitive and sustainable peace brazil's embattled

presidential has accused her opponents of plotting a coup against her. she is facing impeachment after being accused of manipulating the budget to hide the extent of the country's recession. >> reporter: dilma rousseff is fighting for her political survival. less than 24 hours after the biggest political party in brazil pulled out of a ruling coalition, she held an event here at the presidential palace where she unveiled new housing projects for the poor. she used the opportunity to push back forcefully against her critics and left in no uncertain terms how she feels about the impeachment process being waged against her. >> translation: impeachment without proof of crime of responsibility is what? it is a coup. this is the issue. there is no point pretending that we are discussing a hypothetical impeachment. we are discussing a very concrete impeachment with doubt crime of responsibility. there is no point in discussing

whether impeachment is or is not written in the constitution. it is, but what is not written is that without crime and responsibility impeachment can be passed legally and legitimately. the name of that is coup. >> reporter: here at congress a special committee continues their impeachment hearings. they expect to conclude their work by the second week of april. as for dilma rousseff, her popularity continues to flument. a new policy shows 69% of brazilians disapprove of the job she is doing. on thursday for protests are planned the man accused of hijacking an egypt aeroplane with a fake suicide belt has and in a cyprus court. egyptian national held up the plane on tuesday. me was remanded in-- he was remanned in custody for eight days.

the plane took off from alexandria but was diverted to cyprus. all the passengers made it to their designation, cairo. it has been almost a year when kenya's university was attacked. security forces have blamed al-shabab supporters hiding in camps that house somali refugees, but as catherine soi reports from dedaab in northern kenya, refugees are saying they're also victims of the armed group. >> reporter: a security control in this camp, one of five camps in this area in north-eastern kenya. at night these young refugees will take over security operations in the sprawling camp which is home to more than 100,000 somalis. just before dark they map out their routes. there used to be 400 colonel veers like this. now there are only 42. >> translation: -- volunteers like this. >> translation: many people gifl up along the way because

there is no money. we try to patrol all night. our aim is to keep everyone safe >> reporter: safe from criminal gangs or armed groups. this is the largest and most dangerous camp here. even security forces are reluctant to come here at night. government officials and aid workers have in the recent past been killed or kidnapped by al-shabab group, but refugees say that they're also victims of al-shabab. this man asked us to hide his identity. he says he came to this area after his nartdz and brother were killed by al-shabab gunmen in somalia. he still receives mysterious phone calls from people threatening to kill him. he is certain those calling him are the same as those who killed his relatives. >> translation: my life has become difficult. i suspect everyone when i move around in the market. i live in constant fear because i know the people who are threatening me could be in this camp >> reporter: the government sees

the camp as a military threat. >> we can say that the attacks have gone down. there is still a lot of radicalization within the camps. >> reporter: al-shabab fighters have carried out a series of attacks in sen i can't. most notably an attack on a university last year where 148 people were killed and another one in a mall. 67 people were murdered. some of the attacks were planned in the camps. i asked this leader if he thinks that the camps have been infiltrated by al-shabab. >> >> translation: the problem you're talking about is real, but i cannot talk freely and explain the details. that should tell you something >> reporter: many refugees in this half a century old settlement are now living in fear caught between al-shabab on one side and kenyan government forces who don't trust them on

the other children's rights campaigners say they're outraged that authorities in france have kept an eight year old boy at paris' main airport for over a week. he was reportedly put on a plane unaccompanied from the indian ocean by his mother. francois hollande has dropped plans to strip french citizenship from dual nationals who are convicted of terrorism. the bill to change the constitution was put forward polling november's paris attacks. >> translation: the national assembly in the senate have not agreed on the text in regarding stripping french citizens of terrorism more from jacky rowland in paris. >> reporter: these proposals to reform the constitution included not only the plan to strip dual nationals of their french

nationality if convicted of terror offences, but also a plan to make it easier for the president to introduce a state of emergency. currently the system is that parliament has to vote on that. the idea was that the president would simply be able to bypass parliament in declaring a state of emergency. in the end francois hollande was not able to muster the political support for these proposals. we have to remember as well the atmosphere in which this constitutional reform was first raised when it was first mentioned it was in the aftermath of november 13. he was under a lot of pressure from politicians and the right wing republican party, the far right national front, a lot of criticism of the french security forces, intelligence agencies, why hasn't they anticipated these attacks. this was his response, his way of trying to appeal to that kind of public opinion, but months later we've seen there was not the support from the left wing of his own party, his own

justice minister actually resigned on principle because she would not support this idea. ultimately when it came to it, the numbers were not there, not in the parliament, the national assembly nor in the senate, which is why we've seen this climb down by the president the world's largest mangrove rain forest is under threat in the past two years there have been three environmental accidents in the area. little is being done to protect the world heritage site. >> reporter: in the late afternoon of march 19, a barge carrying more than 1200 tons of cold sank in a dolphin sanctuary. that's not what these men are working to salvage. instead, they're still pain stakingly securing the coal from another cargo vessel that sank in this area back in october last year. >> translation: we have to be very careful when we're lifting the coal out. if we move it around too much,

it can start to dissolve and spread in the water >> reporter: the barge that sank this month was carrying almost three times as much coal and salvaging that wreck is expected to be a much slower task. it was the third time in just two years that a vessel carrying coal or oil has sank in this particular stretch of the water. after the latest sinking, the bangladesh government announced a ban on cargo vessels in the river, but a ban had also previously been announced in 2014 after a large oil spill only to be lifted last year. >> translation: this is the will only route that connects the area. the other routes have become too shag owe. to shut this down was a huge economic blow for the country. >> reporter: this is the largest mangrove rain forest in the world. it has become the focus of large protests. environmentalists are not just angry about cargo carrying

dangerous materials, but also the building of a power plant that will be built 15 kilometers from the site. >> it will be unprotected if it is gone. any projects that will harm it, cannot be called development. >> reporter: the government says the coal plant is vital to meet the country's growing energy demands. with economic needs competing with environmental concerns, the rain forest looks set to remain the center of a tug of war between activists and the government if you're into 30 this will mean little to you, but it will bring a touch of nostalgia. one of the first video cassettes is about to disappear into history. sony says it will no longer sell the betam ax tape in japan. that's the only country where it is still available. >> reporter: now you see it and soon you won't. betam ax, one of technology's

greatest losers. 40 years ago when video recorders were new and industry was looking for a standard tape size, it made all the early running, produced by sony, deported by the even mightier japanese government, but then along comes the vhs produced by all of sony's rivals. the vhs catches on and the rest is history. at least to most young people, the vhs is still recognizable. they would have seen it on the shelves of their parents or even grandparents, but the beta what? >> reporter: they made its last beta machine in 2002. in 2013 it stopped producing the tapes now with a shipping out of the last of its tape stock it marks the death of a format that held ever so briefly the promise of a golden video age. now relegated to the museum and

to the memory of people old enough to remember such a thing ever existed betam ax was better, though. there's plenty of video, digital this time, along with the latest news, at our website. look at aljazeera.com game down? >> absolutely not, no one was slowing the train down. >> and the white house trying to rein them in today. thank you for joining us i'm joie chen. tonight a look at crime, justice and what may prove president obama's last major campaign. an all-out effort to force change in the criminal justice system. a key part reducing the sentences that many consider excessive for minor drug crimes. i