Former US President George Bush (R) is shown in this file photo talking with former Soviet President Mikhail Gorbachev (C) 01 June 1990, during a signing ceremony at the White House in Washington, DC. The two world leaders signed the foundation of a treaty for the first-ever cuts in nuclear missiles and a pact to slash chemical weapons stockpiles. AFP PHOTO Jerome DELAY        (Photo credit should read JEROME DELAY/AFP/Getty Images)