"In the very different circumstances and culture of Eastern Europe, in contrast, Communist regimes successively collapsed in 1989. The end of the Cold War had been long envisaged, but largely through negotiations between states. That was not to be the key element in 1989. Instead, Gorbachev unintentionally provoked the fall of the Soviet bloc. His attempts to push through modernisation in Eastern Europe (which totally surprised the East German leadership who argued that there was no need for reform or openness) left the regimes weak in the face of popular demand for reform and for more change. Moreover, Gorbachev was unwilling to use the Soviet Army to maintain these regimes. Visiting Prague in April 1987, Gorbachev repudiated the Brezhnev Doctrine of intervention in order to uphold Communism (‘the defence of the Socialist Commonwealth’ in Soviet terms), intervention which had been used in Czechoslovakia in 1968. Instead, Gorbachev claimed that ‘fraternal parties determine their political line with a view to national conditions’. On 7 December 1988, he announced, significantly at the United Nations in New York rather than at a Communist gathering, that Eastern European states should be free to choose their own political path. This was a clear signal for change, and for a reduction in international tension. In his speech, Gorbachev also declared that the Soviet armed forces would be cut."