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joining me now is richard engle. thank you for being here. >> it is good to be with you.tially the most explosive. this could escalate very quickly when you so many troops mobilized by saudi arab ya. you have the new lib run by the military that wants to flexion it's muscles and egypt announced it wants to lead a new effectively arab army. so we are at a real inflection point in the middle east, and i think we could see a lot of changing and volatile dynamics in yemen. it is even weirder than you were describing. it is more concoluded. the u.s. is helping this mission in tikrit being backed by the militias. and the militias say they will back the operation. that is in iraq. in syria, the u.s. is fighting against iran and is an enemy of iran which supports hezbollah and the government of bashar al assad. in syria the u.s. is also fighting with iran against isis. it is even confusing for me. in iraq we're fighting with iran. in syria we're fighting both with and against iran. and in yemen, now we're backing saudi arabia, egypt, and this other coalition. we say we're not goi

>> richard engle, thanks so much. >>> tens of thousands took to the streets in tunisia today in a show of solidarity against islamic militants. they were joined by several world leaders including the president of france and italy's prime minister. the march comes one day after security forces killed members of a group blamed for recent deadly attack on the bar doe museumdot museum. in another show of resilience, that museum reopened to the public. >>> pope francis held palm sunday mass in st. peter's square today, ushering in east ear's holy week start. tens of thousands took part waving palm leaves and olive branches. the pope remembered those that died in the germanwings crash. and others died defend defending their faith. >>> the talks on scaling back iran's nuclear program is going down to the wire with two days before the deadline for an initial agreement. each side says the other needs to make tough choices. our chief foreign correspondent, andrea mitchell has the report from switzerland. >> reporter: it has been a grueling round of talks as six world powers led by john kerry tri

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nbc news richard engle reports. >> saudi arabia has long been known for getting washington to fight its battles, not this time. these saudi fighter jets are on their way to attack rebel positions in yemen targeting a command center and aircraft used by the rebels who have been trying to overthrow the government. the rebels all rueties now control large parts of yemen. they're backed by iran. to fight them saudi arabia says it's bombing with 100 jets imposing a no fly zone and mobilizing 150,000 ground troops. no invasion yet but that's clearly an option. the saudi coalition of ten muslim nations includes jordan and egypt which sent warships to defend the yemeni coast and offered to send forces. >> iranian officials protested the strikes in sitzerland for nuclear talks. >> we believe it is a dangerous situation and we advise against any escalation. >> the war in yemen has now become a battle between iran and saudi arabia. two old and well-armed rivals. and neither side appears willing to back down. >> all right. meanwhile in iraq the u.s. and iran have a common enemy in isis but their sh

richard engle tracks down the key players. >> reporter: alexander was an outspoken critic of his own agency so there were many people within the kgb which became the fsb who wanted him dead. he is not the only prominent critic of the kremlin to die under very suspicious circumstances. if you'll remember just about two weeks ago another man, boris nemtsov, was shot down right in front of the kremlin right before he was about to hold a big anti-putin rally. >> what do we know about the chief suspect in this case? >> reporter: he's now a member of the russian parliament. we sat down to interview him. he has his own tv show in russia. he just got a medal from putin for service to the father land and he denies that he put any polonium in the tea. >> nice to talk to you. thanks so much. we'll be watching. "dateline" tonight at 8:00 on nbc 4. >>> march madness can be so distracting it's actually costing companies billions of dollars. a staffing firm called challenger, gray & christmas found the highly anticipated basketball tournament is a productivity killer. researchers say it costs emplo