Speaking at the opening of an exhibition called Indomitable Ukraine on Tuesday evening, the former prime minister said the UK is “still apprehensive about the consequences” of stepping up support.

He asked why frozen Russian assets are still not being used to fund the war effort, why the UK is still buying uranium from Russia, why it has not sanctioned Russian energy company Rosneft and why it has not imposed secondary sanctions on those still buying hydrocarbons from Russia.

Mr Johnson said: “I’ll tell you why. It’s because we’re still apprehensive about the consequences, and because we still fundamentally lack the will and the leadership and the sense of urgency to get this done.

“When you consider the immensity of their (Ukrainians’) sacrifice, there is absolutely no excuse for our c

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