S. because we are allowed to maintain nuclear superiority until all other member nations have complied. The soviets of course identified this problem and argued that all nuclear weapons should first be destroyed ( including the U.S. weapons ) and then the materials and research after. Neither side would agree so we get deadlock. Tensions rise.
In attempts to push back the soviet grip on eastern Europe the U.S. stopped its supply of lend-lease assistance to the soviets. They hoped that without so much reconstruction funding that the soviets would give up some for the territory that they had claimed in Europe. The Soviets however used this as an excuse to tighten its grip on eastern Europe. Stalin would say that with western hostility growing, that holding eastern Europe was in fact a defensive move on his part. A very ugly relationship was forming out the old relationship between these two super-powers.
In march of 1947 president Harry Truman produced the Truman Doctrine. This can be labeled as the "official"start of containment. The Truman Doctrine was concerning the communist insurgent movements in Greece. Since Great Britain had lost the strength to hold it's authority in Greece they were powerless to stop the leftist movements. If the communists won this victory in would spread itself into Turkey, which was considered to be a major U.S. interest at the time. Because this document did not rally a great amount of support that Truman would need to achieve his goals, he very vigorously addressed congress on March 12, on very serious terms. President Truman claimed that U.S. security interests were now spread worldwide, and that the fate of all free peoples, not only those Greece and Turkey, were on the verge of falling. He said that communism would spread to every corner of the globe and eventually even threaten the U.S. unless they provided aid to countries that were being forcefully pushed to communism with no resources with which to stop it.