Sir Julian Lewis: President Trump says that he wants his legacy to be that of a peacemaker. In his difficult conversations with the President in a few days’ time, will the Prime Minister remind him that the reason the enforced division of Czechoslovakia before the war was a step on the road to disaster, but the division of Germany at the end of the war did not lead to world war three, was that the western half of Europe at the end of world war two was not demilitarised? If there is to be a stable Ukraine after any such enforced division, there must be military protection for the unoccupied half of Ukraine.

[The Prime Minister: The right hon. Gentleman is right to talk about peace. It is what everybody wants, not least the Ukrainians, but it must be a lasting peace and not a temporary ceasefire. I agree that that means it needs security guarantees. The configuration of that needs to be agreed, but the security guarantees must be sufficient to deter any further aggression. Otherwise it will be a ceasefire, and that would be the worst of outcomes for the whole of Europe.]