So far, Russia's nuclear threats are just that - threats - but Vladimir Putin appears to be backing himself increasingly into a corner with deeply worrying prospects. Moscow correspondent @DiMagnaySky Please use Chrome browser for a more accessible video player The US president is hardly unique in saying the risk of a nuclear "Armageddon" is higher now than it has been since the Cuban missile crisis - or as it is known in Russia, the Caribbean crisis. Anyone who has thought for more than five seconds about Vladimir Putin's nuclear threats given the geopolitical state of play would conclude the same and indeed, it is a staple comment across Russian state TV. And though the Russian president's assertion that "this is not a bluff" is the kind of statement you make when you're bluffing, Russia's nuclear arsenal should be taken seriously. That is why it's there. Ukraine war live updates Clearly, US officials are, which is why they have reportedly been making firm comments behind closed door