No, Bulgaria was never part of the Soviet Union. However, it was a member of the Eastern Bloc, a group of communist countries aligned with the Soviet Union during the Cold War. Bulgaria was a socialist state under Soviet influence, but it maintained its own government and did not become a part of the Soviet Union.
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No it was not. It wasn't even bordering USSR. Serbia was a part of Socialist Federal Republic Yugoslavia. Yugoslavia was a part of the non aligned movement. Although it was a part of eastern block right after WW2 till 1949 when Tito-Stalin split occurred. So it wasn't a part of USSR at all.
No, Yugoslavia was not a republic of the USSR. In fact, they were apparently idealogical rivals, and Soviet invasion was apparently a very real threat.
Belarus and Ukraine were part of the Soviet Union. Romania was not.
No. The now defunct Soviet Union consisted of many countries that spread from the east of Europe to the east of Asia. Some of the countries in eastern Europe were part of what was known as the Soviet bloc, but not part of the Soviet Union. This would have included countries like Poland, Romania and Bulgaria, amongst others. Some of the eastern European countries, that now have their independence, like Lithuania, Lativa and Estonia, were part of the Soviet Union.
The Soviet Union decreased pollution and safety for the Caucasus region.
All of the former soviet union was once a part of the mongol empire. there were probably a lot more, too.
No, China is not part of the Soviet Union and never has been. In fact, as of December 8, 1991, no country is "part of the Soviet Unon" because the Soviet Union was dissolved and no longer exists.