Read the passage given below carefully and answer the questions:
The Western alliance was formalized into an organization, the North Atlantic Treaty Organisation (NATO), which came into existence in April 1949. It was an association of twelve states which declared that armed attack on any one of them would be regarded as an attack on all of them. Each of these statuses would be obliged to help each other. The eastern alliance known as the Warsaw Pact was led by the Soviet Union, created in 1955 and its principal function was to counter NATO’s forces in Europe.
1. What does NATO stand for?
2. What was NATO’s policy?
3. What was the Warsaw Pact?
4. Mention the main function of the Warsaw Pact.