US President George Bush (2nd-L), his Soviet counterpart Mikhail Gorbachev (2nd-R), US First Lady Barbara Bush (R) and Raisa Gorbachev (L) laugh 30 July 1991 in Moscow in Kremlin St Katherine's Hal at the beginning of the two-day US-Soviet Summit dedicated to the disarmament. Nine years of talks were successfully concluded 31 July when two heads of state signed START, the Strategic Arms Reduction Treaty which will cut the superpowers's nuclear arsenals by up to a third. The Soviet leader called the treaty "a moral achievement" which replaced "militarised thinking" with "normal human thinking".        (Photo credit should read JONATHAN UTZ/AFP/Getty Images)