После войны в Корее Нато превратилось фактически в военный союз по инициативе США.
April 1949. The NATO headquarters are in Brussels, Belgium,[3] and the organization constitutes a system of collective defense whereby its member states agree to mutual defense in response to an attack by any external party.
For its first few years, NATO was not much more than a political association. However, the Korean War galvanized the member states, and an integrated military structure was built up under the direction of two U.S. supreme commanders. The first NATO Secretary General, Lord Ismay, famously stated the organization's goal was "to keep the Russians out, the Americans in, and the Germans down".[4] Doubts over the strength of the relationship between the European states and the United States ebbed and flowed, along with doubts over the credibility of the NATO defence against a prospective Soviet invasion - doubts that led to the development of the independent French nuclear deterrent and the withdrawal of the French from NATO's military structure from 1966.
http://en.wikipedia.org/wiki/NATO

Вот - Ваше же подтверждение противостояния (изначального) НАТО СССРу.