international peace conferences, such as the Geneva Summit, and by traveling internationally, such as his 13-day trip to tour the United States in 1959. The World Peace Council founded in 1949 and largely funded by the Soviet Union attempted to organize a peace movement in favor of the concept internationally. Peaceful coexistence was meant to assuage Western, capitalist concerns that the socialist Soviet Union was driven by the concept of world revolution advocated by its founders, Vladimir Lenin and the Bolsheviks. Lenin and the Bolsheviks advocated world revolution through workers' "internal revolutions" within their own nations, but they had never advocated its spread by intra-national warfare, such as invasion by Red Army troops from a neighboring socialist nation into a capitalist one. Indeed, short of such "internal revolutions" by workers themselves, Lenin had talked about "peaceful cohabitation" with capitalist countries. Khrushchev used this aspect of Lenin's politics to argue that while socialism would eventually triumph over capitalism, this would be done not by force but by example. Implicitly, this proclamation meant the end of the USSR's advocacy of the spread of communist revolution through insurrectionist violence, which some communists around the world saw as a betrayal of the principles of revolutionary communism itself. In addition to being a reaction to the realization that a nuclear war between the two superpowers would ensure the destruction of not only the socialist system but the entirety of humanity, it also reflected the USSR's strategic military disposition - the move away from large, and possibly politically offensive, military ventures towards a force centered on proxy wars and a strategic nuclear missile force. Although disquiet over this shift helped bring Khrushchev down, his successors did not return to the antagonistic contradiction theories of an inevitable conflict between the capitalist and socialist systems. Initially, this was China's main gripe with the theory, and the reason the latter from then on classified the Soviet Union as a "betrayer of the Revolution." Cuban policy One of the most outspoken critics of peaceful coexistence during the early 1960s was Argentine Marxist revolutionary Che Guevara. As a leader in the Cuban government during the October Missile Crisis, Guevara believed that a repeat invasion by the United States (after the Bay of Pigs) would be justifiable grounds for a nuclear war. In Guevara's view, the capitalist bloc was composed of "hyenas and jackals" that "fed on unarmed peoples". Chinese policy Premier