Did the Soviet Union at anytime consider annexing any of its satellite states into the USSR? I read that Todor Zhivkov, the leader of Communist Bulgaria, once called the nation the 16th republic of the USSR and made requests for Bulgaria to become part of it, and was wondering if there was any movement by these republics to become part of the Soviet Union. Additionally were there any people in the USSR advocating expansion, especially considering some places like Poland had been part of Russia prior to the Communist Revolution?