Why did george f kennan believe that containment was the best response?

George F. Kennan believed that containment was the best response to the Soviet Union because he viewed communism as a fundamentally expansionist ideology that sought to spread globally. He argued that allowing Soviet influence to grow unchecked would threaten democratic nations and world stability. By containing Soviet power and preventing its further expansion, the West could weaken the Soviet Union over time, ultimately leading to its decline. This strategic approach aimed to balance power without provoking direct military conflict.