switched off by the invulnerability of the two providers of the mutual terror". America's "European allies were brought along to acquiesce in the United States engaging in the rational activity of discovering whether there was after all some defence against nuclear attack ... by the apparent assurance obtained from the United States that it was only engaged in experiment and research, and that, if there were any danger of effective protection being devised, of course the United States would not avail itself of that protection without the agreement of its European allies. That was the first recent event which shook to its foundations the nuclear deterrent with which we had lived these last 30 years". The second event was Mikhail Gorbachev's offer of both the Soviet Union and the United States agreeing to abolish intermediate-range ballistic missiles. Powell said that Thatcher's "most significant point was when she went on to say that we must aim at a conventional forces balance. So, after all our journeys of the last 30 or 40 years, the disappearance of the intermediate range ballistic missile revived the old question of the supposed conventional imbalance between the Russian alliance and the North Atlantic Alliance". Powell further said that even if nuclear weapons had not existed, the Russians would still not have invaded Western Europe: "What has prevented that from happening was ... the fact that the Soviet Union knew ... that such an action on its part would have led to a third world war—a long war, bitterly fought, a war which in the end the Soviet Union would have been likely to lose on the same basis and in the same way as the corresponding war was lost by Napoleon, by the Emperor Wilhelm and by Adolf Hitler. It was that fear, that caution, that understanding, that perception on the part of Russia and its leaders that was the real deterrent against Russia committing the utterly irrational and suicidal act of plunging into a third world war in which the Soviet Union would be likely to find itself confronting a combination of the greatest industrial and economic powers in the world". Powell said, "In the minds of the Russians the inevitable commitment of the United States in such a war would have come not directly or necessarily from the stationing of American marines in Germany, but, as it came in the previous two struggles, from