From the end of World War II to his death in April 1985, Enver Hoxha pursued a style of politics informed by hardline Stalinism as well as elements of Maoism. He broke with the Soviet Union after Nikita Khrushchev embarked on his reformist Khrushchev Thaw, withdrew Albania from the Warsaw Pact in 1968 in protest of the Warsaw Pact invasion of Czechoslovakia, and broke with China after U.S. President Richard Nixon's 1972 visit to China.