How did the policiy of containment contribute to tensions during the Cold War?

In 1946, diplomat George Kennan, in his famous "Long Telegram," described the Soviet Union as evil and that it was the United States's duty to confront communism wherever it attempted to grow.  President Harry Truman created a policy called "containment" which used varying degrees of force to stop the spread of communism.  The United States provided aid to rightist guerrillas in the Greek civil war in order to avoid a communist takeover there.  The United States also influenced an election in Italy when it looked like leftists would take over the nation.  The United States spent money on project such as Radio Free Europe in order to carry out a propaganda war against the Soviets.  The United States also used conventional warfare on the Korean peninsula when North Korea invaded South Korea.  All of this created tensions with the Soviet Union because the Soviet Union thought that the United States was spreading its influence all over the world. It sought to spread its influence by sending aid to communist regimes in North Vietnam.  The United States thought that all communism regimes were controlled from the Kremlin, so it sought to stop all leftist movements in the developing world, even at times when it had to support rightist dictators.