Which country attempted to adopt a multiparty political system and withdraw from the Warsaw Pact in 1956,provoking a violent Soviet response?

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In 1956, Hungary attempted to adopt a multiparty political system and withdraw from the Warsaw Pact, which was a military alliance between the Soviet Union and its satellite states. This move provoked a violent response from the Soviet Union, which sent in tanks and troops to crush the Hungarian uprising. Thousands of Hungarians were killed or injured, and many more were arrested or fled the country. The Hungarian Revolution of 1956 was a defining moment in the Cold War and demonstrated the limitations of Soviet power in Eastern Europe.

Which Country Attempted to Adopt a Multiparty Political System and Withdraw