Downing Street Years - Margaret Thatcher [150]
We had received firm assurances that the SALT II Agreement, reached between Presidents Carter and Brezhnev in June 1979, would not affect the situation regarding our own deterrent. But our aim was, if possible, to conclude an agreement with the Americans on purchasing Trident before the end of that year, so that it could not get caught up in the argument in the run-up to the expected ratification by the US Senate of the treaty. We also wished to have the decision made before President Carter became too preoccupied with the 1980 presidential election. The Trident missile included the advanced and very important technology of multiple nuclear warheads, each separately targetted (MIRVs). Not only was this the most up-to-date and therefore credible system — as measured against Soviet anti-submarine warfare capability and anti-ballistic missile defences — but by purchasing it from the Americans we could hope to avoid immensely expensive improvement programmes like Chevaline. On 6 December 1979 the ministers concerned agreed that the best system to replace Polaris was the Trident I (C4) MIRV system if it could be purchased from the US, less the warheads and the submarines carrying the system which would be produced in Britain. The decision was later confirmed by Cabinet.
But at this point the most troublesome and annoying complications began. Although President Carter told me that he would supply us with whatever we needed he was desperately worried that news of his decision would cause him political difficulties. He had invested great political capital in the SALT II Agreement whose chances of being ratified by the Senate were already in doubt. He was worried that the Soviets might respond to his agreement to supply Trident with some action which would result in a failure to ratify. Consequently, I was not able to speak openly about the matter when I saw him with his colleagues in Washington. The Americans were also keen to ensure that the announcement on Trident did not occur before the scheduled 12 December meeting of NATO to decide on deploying Cruise and Pershing. I could see the sense of this. But in view of the problems which SALT II was facing I began to be anxious lest the decision on Trident be postponed well into 1980.
With the Soviet invasion of Afghanistan at the end of the year the prospects of ratifying SALT II immediately sharply receded. But at this point the US Administration said that it was reluctant to announce the Trident decision because it could be seen as an overreaction to events in Afghanistan. The Americans were similarly unduly worried about the attitude of Chancellor Schmidt to the Trident decision. More hard-headedly, the Carter Administration also pressed strongly for both political and financial returns on the decision to supply us with Trident. They wanted us to agree to a form of words which would commit us to expanding our defence efforts. They were also keen to develop their defence facilities at our island of Diego Garcia in the Indian Ocean — something for which I had a good deal of sympathy. There was the matter of a substantial levy which we would be charged for American research and development costs which they were not prepared to waive.
I was not happy about some of these demands: it seemed to me that it was as much in America’s interests as ours that we should have an independent strategic deterrent which would, like Polaris, be assigned to NATO and, except where the UK Government decided that supreme national interests were at stake, would be used for the purposes of international defence of the western alliance. As with the question of theatre nuclear weapons, it was the Soviet perception of the