. >> alexander as in litvinenko.says that's why he met with litvinenko in london, to tell him about the hit list, to warn him. but, he says, litvinenko didn't buy it. >> he said, "mario, don't care about that." >> he says, "it's b.s."? >> i think it's just a provocation, but please check what's happening. >> but after what happened to litvinenko, scaramella says he takes the hit list seriously. are you frightened for your life? >> well -- do you have another question? >> scotland yard questioned scaramella and eventually cleared him. why? because if you're looking for it, polonium is traceable. using specialized equipment, investigators were able to track it in people and places. >> once polonium 210 had been identified, then across europe, like the slime from a slug all the way across, polonium was popping up everywhere. >> reporter: but not in scaramella. no polonium in his body or anywhere he'd been. so, scotland yard took a hard look at the two russians, lugovoy and kovtun. when detectives retraced their steps, t

alexander letvencoic that he may have killed himself subsequently. he was i will in 2006 and said that he unwittingly handled radioactive material. authorities believe litvinenko was laced with was given tea laced with poison. >>> the rise in recruitment is driven by conflict in eastern ukraine with many polish seeing russia as a direct military threat. tim friend reports from warsaw. >> deep in the woods east of warsaw members of the pair military group are playing war games with weapons that to the sound of real gunfire. their weekend hobby has suddenly taken on a new significance. just four hours drive away is the ukraine border. a country in real conflict. poland's part time militia saying no one can be certain of moscow's intentions. >> we want to be prepared, so the government would not have to train people on the spot. they would have someone trained before. and if something happens we hope it wouldn't, and we hope it wouldn't then we would be do what we have to do. and if this means fighting, then we will probably fight. [music] >> concerns about ukraine and online recruiting videos like this have prompted a sudden increase for volunteers for the param