The UK has condemned Russia's "reprehensible" nuclear threats and said the mobilisation of reserves was a sign its invasion of Ukraine is "failing".
In an extraordinary televised address, Vladimir Putin claimed that the West was engaged in nuclear blackmail against Russia and that he is unafraid to retaliate with "lots of weapons."
The Russian President, who continually misrepresents the illegal invasion of Ukraine, warned his threats were "not a bluff".