>> world leaders gather for a nuclear security summit but the crisis in ukraine is expected to dominate. >> this is al jazeera, live from doha. ahead - syria accuses turkey of blatant aggression for shooting down one of its jets. justice in egypt. three al jazeera journalists due in court, as is a ruling on the muslim brotherhood. >> 25 years on from the exxon

valdives oil disaster we revisit alaska. >> world leaders are gathering in the hague. it is likely to beovershadowed by the crisis in ukraine. russia's foreign minister sergei lavrov arrived for the talk. russian troops have surrounded one of the last ukrainian marine paces in crimea. russia is taking over military control of the peninsula, base by base. in kiev, thousands gathered for a rally, calling for ukrainian unity. it is supported by the west, including the u.s. and europe. >> there are growing fears that other parts of ukraine will breakaway following the annexation of crimea.

two pro-russian groups fought in donetsk in the east. it happened during a rally. n.a.t.o. alliance is concerned about a threat to mald owa, the nearest allied to ukraine. there's fears that others may want to join the russian federation. n.a.t.o.'s top commander is warning about a build-up of russian troops on the eastern border. >> if russia is worried about a country moving to the west, a way to solve that is an unkurtion, a frozen conflict and no one wants to bring that nation into n.a.t.o., because it may mean conflict with russia. >> the u.s. is hoping china will take a more proactive stance.

chinese president are scheduled to meet with president obama at the hague. china abstained for a u.s. council resolution, instead of voting with russia. the u.s. determined this as potential for leverage. with barack obama on a soft power tour many are watching which side, if any, the chinese will report. >> we go live to beijing. margo, the u.s. president to meet his chinese counterpart. what is the u.s. asking from the chinese when it comes to this situation in ukraine? >> well, what they are wanting china to do is take a stand on the u.s. and european side, which is asking russia to hold back in a way and not take what they see as an aggressive role in the potential break-up of ukraine. however, china has been clear...

..long-held principal in china, and something that it needs to abide by. in a way, because it doesn't want other countries to interfere or with neighbours of the region. they are embroiled in their own territorial disputes and the last thing china wants is to see u.s. and western involvement in that. at the same time the fact that china sustained in the vote was seep as a subtle show of support. now russia being sanctioned by the west could mean increased dependence or relationship between russia and china. this will be good for the chinese economy in the long run. what is working is it's not taking a stand, keeping it

friendly with the russians and the europeans. >> thank you, margo ortag es in beijing. >> all the eightest news on the situation including the g7 meetingment you can find that at al jazeera, at live.al jazeera.com >> syria is accusing turkey of blatant aggression. it's challenging the blame that it was violating turkish air space. it ignored four warnings to turn back. the prime minister says the strike should serve as a warning against further incursions. >> the battle for the vital strategic crossing between kazaa now involves the turkish military, as syrian rebels

cheered, the remains of a fighter jet burns in the mountains. it was shot down by f-16s after turkey said the syria jet crossed into its air space. at a political rally, part of the lead-up to elections on march 30th, the turkish prime minister was in fighting form. a syrian plane violated the air space. the f-16 took off and hit the plain. why is this because if you violate the air space a slap will be hard. damascus says the plane was in airplanes if the jet attacks. >> translation: i released my target 7km inside syrian territory. >> it's the second time turkey downed a syrian military

aircraft. turkish f-16s shot a helicopter in the same reason after it strayed across the border. the kazaa crossing matter, because it's the last northern border post to be captured by opposition fighters. >> at a rally in istanbul, prime minister recep tayyip erdogan chose not to talk about the fighter plane, focussing on domestic politics, and corruption allegations, he described alleged wire taps, suggesting they'd been fake. >> addressing a sea of supporters, recep tayyip erdogan lashed out at social media websites. he said twitter, you have to be honest and act according to turkish law. >> the shooting of a fighter jet will make prime minister recep tayyip erdogan appear decisive before local elections. it sends a warning to the syrian

government. >> let's look at other world headlines. there are reports that three cases of the highly contagious ebola virus have surfaced in the capital of guinea, and has killed 59 people. it's the first outbreak of ebola in the country. >> taiwanese place broke up a protest in a building in tapei. dozens of people have been injured and 50 detained by police. they were protesting against a trade deal with china. >> china has said it spotted what it calls suspicious objects in the search for the missing malaysian airliner. it's not clear what they are. the area in the southern indian ocean is the focus of the search. three al jazeera journalists held in a cairo prison are due

to go on trial shortly. mohamed fadel fahmy has been taken to a hospital for a how older injury, his with peter greste, and mohammed badr. they are accused of having likss to a terrorist organization and spreading false news. abdullah al-shami, from al jazeera arabic has been in custody for six months. al jazeera rejects charges and demands their release. >> a judge will agroups a ruling on a mass trial of demonstrations. it's a crackdown by the government on the muslim brotherhood. >> it's one of the largest trials in egypt. muslim brotherhood's ritual leader, other senior members and

hundreds of supporters face a list of charges storm a police station and damaging property. charges dismissed by their lawyers as fabricated and politically motivated. this is one of many trials targetting muslim brotherhood numbers, as supporters of deposed president mohamed morsi. the group's followers are defiant. almost every day sips the army took over last july protesters have been on the streets calling for reinstatement. a candidate, mohamed morsi, was egypt's first democratically elected president. the freedom and justice party won almost half of the seats in the 2011 parliamentary elections becoming the biggest political

party. it was short-lived. thousands of egyptians voiced their protests. then the army stepped in. the muslim brotherhood was designated a terrorist organization after a string of attacks and suicide bombings targetting security forces. the group denies links to those attacks. international riot groups expressed concerns over human rights violations in egypt. thousands of supporters are in gaol. hundreds were killed when security forces raided two camps last august. >> lots more ahead - including the fight for justice continues. almost four decades after arge

tina's dirty war. we have the details. >> have you ever wondered who is in charge of the internet? a meeting is taking place to discuss just

>> welcome back. let's recap the headlines on al jazeera. russia's foreign minister sergei lavrov arrived in the netherlands for a nuclear security summit. it's expected to befr overshadowed by the ukraine crisis. >> turkey has been accused of aggression for shooting down a syrian jet. it's claimed it was violating

turkish air space. >> a trial for mohamed fadel fahmy, mohammed badr, and peter greste is due to start in a few hours. they are accused of having links with a terrorist organization and spreading false news. al jazeera rejects all charges against its staff. >> in the u.s. state of texas an oil spill blocked the movement of ships, a barge carrying 3.8 million litres of fuel oil began to leak after the collision. the area is home to several bird habitats. the clean-up takes place 25 years after the largest spill in u.s. history when "exxon val dooefs" ran aground. it contaminated thousands of kilometres of coastlines, we have a report on the lasting effect of the spill. >> they didn't have this 25 years ago - a computer

simulator to teach marriners about alaska's trickery coastal waters. it's real, the decks appearing to heave on the swell. there's no way to practice. >> it's as real as it gets, without being in danger. it's hard to convince yourself that you are not in danger. it's totally real. it's virtually real. >> wh when exxon hit the reef, billions of litres went into prince alfred sound. the clean up and court cases wept on for years. a quarter of a century later, the waters look clean, the scenario as splendid as ever. problems remain with the environment, animals and humans. thousands lost livelihoods as fish stocks collapsed. possible left his salmon boat to

scrub beaches, and fell ill, probably due to chemicals. it took a transplant to restore his health. >> i ended up with an autoimmune disease, my bone marrow failed. i had two or three other complications from that. earlier it was 16 years for me. >> they grow quickly. >> this doctor is a sea otter expert and rescued hundreds from the spill. thousands perished, and this doctor says the captivating animals are only now recovering in the wild. >> this is the crude oil collected 25 years after the date. >> they are finding oil on shore. rick steiner worked on the disaster and now cleans up stills around the world.

he's learnt that transporting petroleum is risky, and there's only one way to lower the risk. >> there's more oil produced and burned in the world since the exxon valled eaves spill. it's stunning, we have to get better at using oil efficiently and transitioning to low carb sustainable energy. >> until that happens, those that live in this place can't help but worry about a spill. the rock of the exxon valled eaves lead to safer shipping. with the demand for oil growing by the stay, disaster lives on in the minds of many. >> a landslide in the u.s. state of washington killed at least eight people, devastating a neighbourhood of about 30 homes, several people were injured, 18 are missing.

with the football world cup weeks away, brazil's police have been cracking down and have been focussing on the international airport. >> federal police take two nigerian passengers away. they are suspected of carrying drugs. they were checking in for a flight, but tourists aroused suspicion. searching their luggage, police find what they are looking for packed in the lining of the case. an investigator takes samples of the powder. if the dropped turn blue, it confirms it's cocaine. >> inside the suspects suitcase is several purses. inside were white packets.

this is cocaine. >> it's four kilos, 1.6 tonnes of cocaine, trying to smuggle it out of the airport. 24 people were arrested for cocaine smuggling. police say the drugs are destined for africa and the gulf countries before heading to its final destination. >> africa is a warehouse for the drugs before they can be trafficked. the cocaine that goes on flights passes through in transit to the other markets. with only a handful of police agents working. in an airport that 36 mill within passed through.

stopping everything is impossible. behind the drug mules there's a network of mafia that runs the trafficking operation, according to this officer, who didn't want to be identified. the mules arrive with little money. they are told to go to a hotel where they are contacted by traffickers. they are handed a ticket and sent to the airport. >> on this night two are arrested, no telling how many others got through in what could be a busy airport for drugs. >> argentina marks memor cal day for truth and -- memorial day for truth and justice. an estimated 30,000 people were kidnapped, tortured and killed

by the government. >> thousands of military files, information on some of those held in clan des tine detention centres in the 1970s, and 80s have been turned over to the civilian authorities. they have been processed and made available to the public. there's more to follow. the defence minister said the arnal tine military changed since the days of what was known as the dirty war. in a 7-year rein of terror, the military kidnapped and killed thousands, making the documents available for the public is vital in helping the country come to terms with its past. >> it's an important symbolic act for society and the families that want to rebuild history. it's helping to provide documentary evidence to take the

trials forward. the mothers of some victims march every thursday outside the government palace, demanding answers. memorials for the victims come in all forms. 25-year-old long distance runner was picked up by a death squad and never seen again. >> this race is runnery year. courses of 8 and 3km, runners of all abilities determined that the ascertain for justice, the quest to find answers remains in the public domain. >> it's a day to remember. not only miguel, but other victims like him. we came to honour the sportsmen. justice for the crimes against humanity has been slow in coming. some responsible are serving time in prison.

the fight zones on, with the victim's families and the killers dying, argentina is engaged in a recess against time. >> let's take a look at some of the other stories take making headlines. france's far right national party is making gains in elections. francis hollande's governing socialist party lost ground and may lose control of major towns. six people have been killed in a fire on board a fishing boat. two people, including the captain, survived. one person is missing. >> hundreds of people attended the furniture of an afghan journalist killed in a hotel in kabo kabul. >> have you wondered who is in charge of the internet? the world internet regulatory body

is discussing that. >> no one really owns the internet. the u.s. government controls a fair portion of how things run. in the face of pressure, it said it would give uppize regulatory role next year. there's no question about the concerns about u.s. government surveillance have blown open the conversation about internet governance, about who is important and has control over the pipes, the functions, that run the back of the internet. >> what is that structure. the internet began as apunet, a network linking some american universities and government agencies. it was funded by the pentagon, it was opened up to become the internet as we know it. connecting everything from computers to mobile phones to tablets. there's the physical network that carries the traffic, the

backbone with satellites, cables, and wireless routers, and how the signals communicate, the language, so to speak follows clearly defined rules. one is the naming of web addresses. suffixes. for assigned names and numbers. although it's a nonprofit group, many of its decisions require approval from the u.s. department of commerce. that will soon undergo reforms. the idea is to change the stewardship from the u.s. government to the global holder process. and i don't think that anybody would see any difference on the way the internet is performing, because of the things that we are talking about are really at a very high level of the

internet functionality. >> now, there's no definite picture of what the internet's future or structure will be, but the main function is to maintain privacy and cyber security for everyone. >> a lot of medical research is being done by supercomputers. we went to barcelona to find out more. >> this is spain's most powerful computer, with 50,000 microprocessors, capable of doing more than 1,100 trillion calculations a second. it's the massive number-crunching capacity that makes it useful to researchers. >> we use this computer to simulate the target, the scientific would like to know. for the advance of signs. >> but supercomputers are

expensive. this one uses 2 million of electricity, but needs updating every three years. >> they have spent $25 million on an upgrade, but it's not the world's fastest super computer. there's one in china. it is one of the fastest in europe, and according to its creators, one of the most beautiful. >> supercomputers allow engineers to pretest aircraft designs and try out engines before they exist. the computing power has been put to use. involving hundreds of millions of variables. >> the human body is a focus, with a project working on a simulation of the heart. >> we are able to simulate the heart in the muscle. this information can be used

like the implementation of pace makers or for therapies. >> researchers have been analysing the genetic sequences of tens of thousands of cancers. understanding what is going wrong, they hope will lead to personalized diagnosis and treatment. >> sequencing is cheap. hundreds and thousands of patients - you need a big computer and complex protocols to analyse the gee gnomes. this is where computing science is becoming a crucial part of the study of it in general. >> the barcelona super computement is a part of a network that checks the way product development is done, with each powerful upgrade comes

the participation for supercomputers to shape and create our future. >> and, of course, if you want to keep up to date with the stories, head to aljazeera.com. so what? >> wow. there is the only prison in the world with a sun bed. ♪ ♪ ♪ ♪ ♪