Vladimir Putin's nuclear threat is "real and not just words", a Russian opposition politician warns.
Grigory Yavlinsky is a longtime critic of the Putin regime and went on to warn that Russia could use it's nuclear capabilities against Ukraine if they were to try and recapture Crimea.
Yavlinsky, found of the liberal Yabloko party, was born in Lviv and has gone up against Putin in three presidential elections.
