tems, as signed on May 26, 1972. The extraordinary events referred to in Article [XVII] of this Treaty also include events related to the withdrawal by one of the Parties from the Treaty on the Limitation of Anti-Ballistic Missile Systems, or related to its material breach. 82
In this sense, the United States achieved its objective of preserving SDI from any explicit limitations either in START or in a separate treaty. On the other hand, the Soviets were equally clear that they considered extensive development and deployment of SDI by the United States grounds for leaving the START treaty. Whether this posture was a bluff that could be called by an American administration determined to proceed with new strategic defenses was never tested.