Defence Policy: Deterrence

Lord Harries of Pentregarth Excerpts

Thursday 31st October 2024 Grand Committee

[Lord Harries of Pentregarth (CB)]

My Lords, my interest in this area arises from my early academic research on the principles of discrimination and proportion in the just war tradition and their applicability in a nuclear age. This interest was further intensified in my time as dean of King’s College London during the 1980s, when I had the privilege of being a member of a number of think tanks reflecting on the nature of nuclear deterrence, many of them under the influence of the much-missed Sir Michael Quinlan, the architect of British defence policy in its strategic and ethical aspects.

I continue to support a policy of deterrence which contains a nuclear component, but I do so with moral fear and spiritual trembling. It is a morally awesome policy to support. It can be supported only in the belief that it is in principle fundamentally stable, not because human beings are any better than they were—far from it—but because, for the first time in human history, it could not conceivably be in the interest of any power to go to war with another which possessed nuclear weapons. In the words of President Reagan, a nuclear war cannot be won and must never be fought.

I was never a supporter of CND, but it performed an important role in reminding the world of the horrific nature of these weapons. I was appalled a few years ago when there was a period of tension between India and Pakistan to listen to some of the generals involved talking about using nuclear weapons as though they were like any other weapons. They are not like other weapons, and we must never forget that.

We must also not forget that the moral principles which apply to the use of all armed force are equally applicable in a nuclear age: I mean the principles of discrimination and proportion. There are very distinguished ethicists who believe that even the threatened use of nuclear weapons would violate these principles, but when I was most involved, British defence policy was built on the conviction that this was not inevitably the case. I trust that this is so. In that connection, I want to identify with the question raised by the noble and gallant Lord, Lord Stirrup, about graduated deterrence and the ladder of escalation, because that is fundamental to not only British deterrence policy but the possibility of maintaining the use of weapons which are discriminate and proportionate. It is a vital question to which I hope the Minister will be able to give a satisfactory response.

There is an old saying about fighting a present war with the outlook of a previous one. I believe that the major threat at the moment is not the nuclear weapons of another state but their capacity for cyberwarfare. Nuclear weapons are no deterrent to another country that has the capacity to render our whole command and control system inoperative. Although I continue to support our deterrence posture, with its nuclear component, my main concern is in relation to our ability to protect our own command and control structure and our capacity to deter other countries from disrupting it. I hope that the Government will be able to give some reassurance on that.