Sir Julian Lewis: May I ask the Prime Minister to focus on the question of effective security guarantees? Security guarantees deter aggression only if there is no doubt that the guarantor will act in accordance with the guarantee that he has given. Therefore, if there is a security guarantee to unoccupied Ukraine, it is absolutely essential that the guarantor has some forces on the ground, because otherwise a guarantee to an unoccupied region that is a strategic vacuum can lead to a wider war by miscalculation by the killer in the Kremlin.

[The Prime Minister: I thank the right hon. Gentleman for his question. That is why we have done so much work with the coalition of the willing on the capability and planning for land and sea; detailed plans are now as advanced as they can be until we know the next stage of the proceedings. It is also why I have worked so hard with the US to get a US security guarantee going alongside the coalition of the willing, so that the two go together. He will have seen that that is part of the discussion in Geneva, on which we have managed to make some progress.]