What action did the US and other European countries take to prevent Soviet aggression after using Berlin airlift break blockade of Berlin?

The United States, together with several Western European countries, responded to Soviet aggression by forming the North Atlantic Treaty Organization (NATO) in 1949. NATO was a military alliance that pledged collective security, meaning that if any member state was attacked, the other members would come to its defense. By creating a strong military alliance, the US and its allies aimed to deter further Soviet expansionism and protect Western Europe from potential Soviet aggression.