>>508215602Lenin, Trotsky wanted permanent revolution and saw themselves in Europe ruling over entire World consisting of Soviet republics. As soon as a country gets communist government, they become part of Soviet union.
Stalin studied to become Orthodox Priest and his idea was to build Socialism in single country. He became the organizer because intellectuals were to lazy to do actual work.
After most of party positions were pro Stalin and Lenin died, he consolidated power, purged internationalists and Trotskytes. He protected some dissidents like Bulgakov - Stalin saw his play 14 times so it could not be taken from repertoire.
During Stalin's reign Soviet Union had highest economic growth, he developed hydrogen bomb and they were on the verge of space flight when he died.