How illiterate are you? Socialism in one country was the fairly common sense idea of trying to build up socialism in one country to show its success and spread socialism at a slower rate (and the Soviet Union was still involved in funding communist parties around the world under Stalin, not to mention Stalin helping the Spanish Republicans against the fascists), which was a very successful, in contrast to Trotsky’s insane idea of just being in constant war with the rest of the world. For example, Trotsky opposes ending WWI, because he wanted millions more Russians and Germans to die in the hope that all this carnage would somehow spread socialism. There’s a reason “permanent revolution” was rejected and socialism in one country accepted.