In answer to the Prague Spring, the Soviet army, together with most of their Warsaw Pact allies, invaded Czechoslovakia.[181] The invasion was followed by a wave of emigration, including an estimated 70,000 Czechs and Slovaks initially fleeing, with the total eventually reaching 300,000.[182] The invasion sparked intense protests from Yugoslavia, Romania and China, and from Western European communist parties.[183] Brezhnev Doctrine