Presidency of Ronald Reagan to forestall the possibility of an agreement between the United States and the Soviet Union. Nonetheless, both Gorbachev and Reagan agreed to continue arms control negotiations at the October 1986 Reykjavík Summit. At the summit, Gorbachev and Reagan closed in on an agreement to greatly reduce or eliminate the nuclear stockpiles of both the U.S. and the Soviet Union over a ten-year period, but the deal collapsed due to disagreements regarding SDI development. Reagan attacked Gorbachev in a 1987 speech delivered in West Berlin, but negotiations continued. Gorbachev and Reagan broke the impasse by agreeing to negotiate separate treaties on
Foreign policy of the Ronald Reagan administration to this gate! Mr. Gorbachev, open this gate! Mr. Gorbachev, tear down this wall!" The last sentence became "the four most famous words of Ronald Reagan's Presidency." Reagan later said that the "forceful tone" of his speech was influenced by hearing before his speech that those on the East side of the wall attempting to hear him had been kept away by police. The Soviet news agency wrote that Reagan's visit was "openly provocative, war-mongering." The East-West tensions that had reached intense new heights earlier in the decade rapidly subsided through the mid-to-late 1980s. In 1988, the Soviets officially declared