South Africa's involvement in the Korean War produced a significant warming of relations between Malan and the United States, despite American criticism of apartheid. Until the early 1960s, South African strategic and military support was considered an integral component of U.S. foreign policy in Africa's southern subcontinent, and there was a steady flow of defence technology from Washington to Pretoria. American and Western European interest in the defence of Africa from a hypothetical, external communist invasion dissipated after it became clear that the nuclear arms race was making global conventional war increasingly less likely. Emphasis shifted towards preventing communist subversion and infiltration via proxy rather than overt Soviet aggression.