How genuine is Putins no bluff nuclear threat?
After Ukraine's startling counteroffensive in the war with Russia we now have an emphatic response from the Kremlin.
Vladimir Putin has ordered Russia\u2019s first mobilisation since World War Two and threatened nuclear retaliation, insisting: \u201cI\u2019m not bluffing.\u201d
So is he or not? And how will the West react?
\u2028Tom Bradby finds out what you need to know from John Ray, our correspondent in Ukraine and only a few miles from the Russia border, and our resident Russia expert Emma Burrows.