FILE - In this Dec. 16, 1984 file photo, Mikhail S. Gorbachev poses with Britain's Prime Minister Margaret Thatcher at the prime minister's official country residence in Chequers, north of London. Gorbachev’s impromptu appearance at the prime minister’s home was revealed in a confidential telegram made public Friday Jan 2, 2014 by the National Archives under the “30-year rule” for declassifying secret documents. (AP Photo/File)