sentences:  In following years, discussions with the Soviets were conducted under Matlock's "Four-Part Agenda" including Human Rights, Regional Issues, Arms Control, and Bilateral Issues.On November 25, 1983, Soviet leader Yuri Andropov announced the resumption of nuclear missile deployment in the western U.S.S.R., a sign of the increased tension in the relationship.The thaw in relations can be taken to begin with Ronald Reagan's January 16, 1984 speech declaring that the U.S. and U.S.S.R. had "common interests and the foremost among them is to avoid war and reduce the level of arms" in which he added that "I support a zero option for all nuclear arms."