 Secretary of State Cyrus Vance then negotiated SALT II with Soviet Ambassador Anatoly Dobrynin without Toon, causing an upset Toon to publicly question the agreement's verification procedure.President Carter signed the treaty but when Soviet-American relations deteriorated he withdrew it from consideration by the U.S. Senate.In the 1990s, Toon co-chaired the U.S.-Russian Joint Commission on POW/MIAs with Russian general Dmitri Volkogonov.