Pan-European Picnic
Mikhail Gorbachev refused to use military force when Poland held free elections in 1989 and Solidarity defeated the Polish United Workers' Party. It was superseded by the facetiously named Sinatra Doctrine in 1989, alluding to the Frank Sinatra song "My Way". The failure to intervene in the emancipation of the Eastern European satellite states and the Pan-European Picnic then led to the fall of the Iron Curtain and the largely peaceful collapse of the Eastern Bloc.