What is the 1st armed conflict during the Cold War?

In the Far East, regional Communist movements took the lead, but received military assistance from Moscow in efforts to eliminate opposing movements and governments. In 1948, the Soviets sparked a confrontation with the United States and its European allies over control of Berlin, the occupied and divided capital of the defeated German nation. He put diplomatic and military pressure on Turkey and Iran in the Middle East and supplied war material to Communists fighting to overthrow the government of Greece. Working with local Communist leaders and movements in the years after the war, Stalin eliminated the political and economic independence of Poland, Czechoslovakia, and other nations in Eastern Europe. The USSR, under a murderous dictator, Joseph Stalin, acted to solidify the wartime conquests of the Soviet Red Army and advance the cause worldwide of Marxism Leninism, an ideology that subverted the very ideals most Americans then held sacred.

Soon after helping defeat Fascist tyranny in World War II, American Sailors faced a new global threat to the United States and the values for which their nation had long been a standard bearer democracy, basic human rights, and freedom.

What is the 1st armed conflict during the Cold War?