Not all reforms were supported by the Soviet leadership, however. Alexander Dubček's political and economic liberalisation in the Czechoslovak Socialist Republic led to a Soviet-led invasion of the country by Warsaw Pact countries in August 1968. Not all in the Soviet leadership were as enthusiastic for a military intervention; Brezhnev remained wary of any sort of intervention and Kosygin reminded leaders of the consequences of the Soviet suppression of the 1956 Hungarian revolution. In the aftermath of the invasion the Brezhnev Doctrine was introduced; it stated that the Soviet Union had the right to intervene in any socialist country on the road to communism which was deviating from the communist norm of development. The doctrine was condemned by Romania, Albania and Yugoslavia. As a result, the worldwide communist movement became poly-centric, meaning that the Soviet Union lost its role as 'leader' of the world communist movement. In the aftermath of the invasion, Brezhnev reiterated this doctrine in a speech at the Fifth Congress of the Polish United Workers' Party (PUWP) on 13 November 1968: