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File photo taken on Dec. 8, 1987 shows US president Ronald Reagan and Soviet leader Mikhail Gorbachev signing the Intermediate-Range Nuclear Forces Treaty in the White House in Washington D.C., the United States. (Xinhua)
File photo taken on Dec. 8, 1987 shows US president Ronald Reagan and Soviet leader Mikhail Gorbachev signing the Intermediate-Range Nuclear Forces Treaty in the White House in Washington D.C., the United States. (Xinhua)