Reykjavík Summit continued, and U.S.–Soviet relations – already strained by the failure of the Geneva Summit the previous year – were further strained by the Daniloff–Zakharov espionage affair. At Reykjavík, Reagan sought to include discussion of human rights, emigration of Soviet Jews and dissidents, and the Soviet invasion of Afghanistan. Gorbachev sought to limit the talks solely to arms control. The Soviets acceded to the "double-zero" proposal for eliminating INF weapons from Europe, as initially proposed by President Reagan in November 1981 (INF denoting "Intermediate-Range Nuclear Forces" as distinct from ICBMs, or intercontinental ballistic missiles). The Soviets also proposed to eliminate 50%
Mikhail Gorbachev Intermediate-Range Nuclear Forces Treaty, saying the move "is not the work of a great mind." Gorbachev also said that "all agreements aimed at nuclear disarmament and the limitation of nuclear weapons must be preserved for the sake of life on Earth." Gorbachev signed the U.S.-Soviet nuclear disarmament treaty in 1987 with President Ronald Reagan. Gorbachev hailed the George H.W. Bush’s role in helping end the Cold War following the news of the former President's death, saying: "We had a chance to work together during the years of tremendous changes. It was a dramatic time that demanded great responsibility from everyone.