Boris Johnson has compared Vladimir Putin to "the fat boy in Dickens" who wants to "make our flesh creep" with threats of using nuclear weapons.
Speaking at a breakfast event on Ukraine at the World Economic Forum in Davos, the former prime minister said: "Putin wants to present it as a nuclear stand-off between between Nato and Russia.
"Nonsense. He's not going to use nuclear weapons, okay. He's like the fat boy in Dickens, he wants to make our flesh creep. He wants us to think about it. He's never going to do it."