The leader most closely associated with Desmond Tutu and FW de Klerk is 3. Nelson Mandela. Tutu and De Klerk were both prominent features in South Africa during the period of apartheid. In fact, De Klerk was the leader of South Africa that won a Nobel Peace Prize with Nelson Mandela for ending apartheid and opening elections to native South Africans rather than simply white Afrikaaners in 1994.
The two organization that were formed to defend against possible communist aggression are NATO (North Atlantic Treaty Organization) and the SEATO (South East Asia Treaty Organization.) These organizations was formed after the World War II, after the communist reign of Adolf Hitler.
As the Cold War came to a close, it was the United States that emerged as the only superpower, since the "loser" of the Cold War was the USSR (Russia) whose global influence had faded.