What is the name of theU.S. diplomat who urged a policy of containment in response to soviet expansion applying political and military pressure to hold the soviets within their current boundries?

The U.S. diplomat who urged a policy of containment in response to Soviet expansion was George F. Kennan. In his famous "Long Telegram" in 1946 and subsequent articles, he advocated for a strategy that would apply political and military pressure to prevent the spread of Soviet influence beyond its existing boundaries. This approach significantly shaped U.S. foreign policy during the Cold War.