During the Cold War the Soviet Unions main objective in engaging in proxy wars against wars in the United States was to spread communism.
On the one hand, during the Cold War era, the URSS led the Eastern bloc of communist countries and sought to expand their political and economic system across the world.
On the other hand, The United States, aimed to stop communism expansion, so that they adopted the containment strategy and led the Western bloc of capitalist countries to face the URSS.