Answer:
The National Security Council is a body of the United States which assists the President of the US in its security policies.
Step-by-step explanation:
The National Security Council is the principal forum of the President of the United States of America to consider the national security and different foreign policies with the other members of the body.
It functions as Council who advises the President on the national security and as well as on the foreign policies of the US.
The National Security Council from its inception assisted the then President Truman who pledged that US would help any countries to resist communism so as to stop its spreading. Truman's policy of containment as formulated by the National Security Council of the US prevented the spreading of the communism in the European nations.
The policy of containment was the foreign policy of the US led by Truman to stop the spread of communism by creating alliances with others and helping the weak countries to resists the advances of the Soviet Union.
Soviet Union was known to posses nuclear weapons which was a threat to the USA. So USA's policy towards the Soviet Union force Soviet Union to publicly remove their all nuclear weapons as there was a fear of nuclear war. Thus this influence the spread of communalism to other parts of the country.