The USSR = Union of Soviet Socialist Republics. Where is the word "communism" there? Communism according to Marx, is a stateless society, without socioeconomic classes or the need for money. Was the USSR stateless? Obviously not. Did they have a currency? Money? Yes. Socialism is the process that leads to communism. As technology advances, society becomes more communistic and democratic. Your claim that communism isn't democratic is false.
You can't expect a socialist country that identifies itself as Marxist and is being threatened with war and economic sanctions, to remain completely democratic and to succeed economically. Socialist nations are like flowers growing in a field of weeds, that are trying to strangle them. The capitalists are the weeds and those flowers might grow thorns and become more militaristic, even authoritarian, under such hostile, austere conditions.
Russia has land, timber, water, oil and lots of other natural resources and remain impoverished and backwards.