Yes, and I am also aware that as a result of Ukraine’s decision to give up those nuclear weapons, Russia guaranteed the security and the borders of Ukraine. If the hon. Gentleman is going to throw international law at me, all I can say to him is that, if he thinks that those sorts of manoeuvres and unilateral renunciations are the way to stop someone being attacked and destroyed by a ruthless adversary, it should be a long time indeed before he and people who think like him have any influence on the way in which we choose to keep the peace—by deterrence—so that we do not end up in a situation like Ukraine.
Fourthly, this horrible situation should establish whether and to what extent economic sanctions can force an aggressor to desist. It is often said that the world has become more interdependent. We will never see a more extreme example of democratic countries seeking to use economic pressures to force an aggressor to desist. If that fails to work in this instance, it will be a further argument for increased investment in hard defence capability, because that particular aspect of hoping to be able to turn war into an outmoded concept will, sadly, have been disproved. I hope that it does play a part in stopping Russia from proceeding, but I am not holding my breath.
Fifthly, the conflict has exposed the folly of fuel dependence on hostile countries and raised questions about the wisdom of a policy of unilateral net zero targets by democracies regardless of what much larger countries, that are not democracies, do. I am not seeking to pick an argument with the environmentalists; I am merely saying that there is a parallel with the question of unilateral or one-sided nuclear disarmament, because if we achieve net zero at tremendous cost to ourselves while much larger hostile countries simply flout the commitments that they have given, we will have taken that pain for no benefit to anyone. Targets must be multilateral if they are going to do anything other than weaken our ability to protect ourselves.
The last of the six lessons is that the conflict has killed the idea that conventional aggression by one state against another is an outmoded 20th-century concept. Time and again, people such as the right hon. Member for Warley on the Opposition Benches and my right hon. and hon. Friends present on the Conservative Benches have raised the question of what an appropriate level of defence investment should be, only to be told from on high, “You’ve got to realise that there are new forms of warfare. The next war will not be fought much with conventional armed forces. It will be fought in cyber-space or even in space itself.” Of course, there are new and serious threats—potentially fatal threats—in those two newer areas of conflict, but they are additional threats. They are not substitutes for the threats that we have always faced and continue to face from conventional armed forces.