The “winds of change” had barely swept across Africa when the newly-independent nations felt the chilling gusts of the cold war. Decolonization created a power vacuum in the prevailing bipolar structure and for a time it appeared that the African continent would be one of the areas in which the struggle between capitalism and communism would be resolved. As the center of gravity of the cold war shifted towards the periphery, the USSR became increasingly interested in extending its influence in Africa. This interest was sharpened as Sino-Soviet rivalry intensified. Under Khrushchev, Soviet policy in Africa was expansionist, vigorous and unrealistically optimistic, both in its assessment of African gratitude towards Moscow and in its estimation of the socialist potential of certain regimes. A series of spectacular setbacks in the Congo, Guinea, Ghana, and Mali led Khrushchev's successors to reevaluate their Third World policies and downgrade Africa as an area deserving extensive Russian resources.