During the height of the Cold War, Latin America became a strategic pillar of the hemispheric defense doctrine, serving a key to the power struggle between East and West. Following the Cuban Revolution and the overthrow of the US-friendly government of Fulgencio Batista, the United States became concerned with the spread of the Soviet Union's influence in Latin America, becoming heavily invested in retaining as much influence as possible. With the nuclear arms race at its peak, a Soviet transfer of nuclear warheads to its Latin American ally in Cuba nearly concluded in the onset of World War III in October 1962. Afterward, the United States hardened its influence throughout Latin America, involving itself in what became known as the "Dirty War", a process that involved questionable actions including supporting or overthrowing governments depending on political leaning, supporting subversive groups such as the Contras with weaponry and funding, or participating in controversial operations such as Operation Charly and Operation Condor. The fallout from these actions affect Latin America–United States relations to this day.