In the ensuing negotiations, the parties agreed on a general framework for SALT II, which takes into account both the Soviet desire to maintain the framework of the Vladivostok Agreement and the willingness of the United States to impose more extensive restrictions under SALT II. However, the United States opposed the inclusion of such a definition, apparently because it would be difficult to write one that distinguishes between UNMIRVed Minuteman II missile silos and MIRVed Minuteman III silos, and because such a definition could stand in the way of a U.S. ICBM-based system with multiple endpoints. . . .