Ukraine news latest: Vladimir Putin may order MARTIAL LAW & shut borders as Russua steps up brutal conscription drive

VLADIMIR Putin faces “catastrophic consequences” if he uses nuclear weapons in Ukraine, the US has warned. National Security Adviser Jake Sullivan has vowed the US will “respond decisively” if the Russian leader followed through with a nuke warning he made on Wednesday. Sullivan told NBC’s “Meet the Press” program: “If Russia crosses this line, there will be catastrophic consequences for Russia. The United States will respond decisively.” He did not describe the nature of the planned US response but did detail how the nation has privately “spelled out in greater detail exactly what that would mean” to Moscow. Putin made the nuclear threat in an address last week and claimed he had “various weapons of destruction” at his disposal – before adding he was not “bluffing”.   Read our Ukraine-Russia live blog below for the latest updates…