No, the most significant property of USSR was it's economical system and the corresponding political system which was called "communism".
Whatever. I made clear what I meant.
US was world's superpower,
It still is and will be for few decades. Later China will probably overtake USA.
and I don't see you riling up against it
You do not know me nor my opinion of USA.
I am riling against Russia, because I live in country that is uncomfortably close to one certain country that is currently in proccess of being fucked up by totally-not-Russia (yeah, riiight). USA is far away and it's moronic military misadventures are far away too, not like moronic military misadventures of Russia. This is why my concern about USA is significantly smaller than my concern about Russia.
You say that USSR has achieved a status of world's superpower at the expense of the neighbors, but you're wrong - it was already a world's superpower. USSR was already a world's superpower before conquering it's neighbors.
I disagree. Obviously Russia was great empire before USSR, but it became superpower after second world war (and resulting changes in world order, including getting tons of countries either under Soviet sphere of influence or outrightly including them in USSR - this is what I meant by "at expense").
I think even concept of "world superpower" came to existence after second world war, when two countries, USA and USSR came to the top. AFAIK only other nation that was described as superpower was British Empire.