Litvinenko has been selling secret information to Sacramella and possibly MI5 and everyone else. That could be the reason of their poisoning. The truth we'll hear from the news will be the one that fits somebody's agenda. One thing is for sure. Litvinenko hurt somebody really bad, and that somebody really didn't like it.
He means that Litvinenko hurted Putin and that Putin killed him ? All this state leaders are killers anyway. They look at the big picture and doesnt mind if a few people have to suffer or get killed.