USSR was almost destroyed by German invasion in 1941-1945. Because most of the population and almost all the industry resided (and continue to reside) in the western part of Russia/USSR, Germany destroyed immense amount of industry, infrastructure, houses, schools, hospitals. Even after capturing territories, Germany destroyed industrial plants because their plan was to completely eliminate people of Russian nationality and to use the captured lands for agriculture - to feed the Third Reich.
Also, they killed almost 30 million of young productive citizen of USSR.
It was a huge knock which almost no other country ever endured. And it set back the development of USSR.
Also, those comments about war and propaganda are also inaccurate. USA started much more wars than USSR/Russia, and as the result of those wars USA killed at least 20 million of people, destroyed infrastructure and industry, plundered resources, e.g. oil of Iraq and Libya. And haven't built anything.
If you'd really study the history, although I'm pretty sure you won't find any accurate information about USSR in the western history books, you'll learn, for example, how USSR built kindergardens, hospitals, schools and industry in Afghanistan and other countries. Investing the money and labor of Russian people in 3rd world countries. Had ever USA did the same?.. Other than printing another billion of USD and "giving" it to some other country, with 90% disappearing in somebody's pocket in transit.
And don't get me even started on propaganda. Do you believe western society doesn't have propaganda? How comes then that you all have the same opinion about everything? Especially on external politics.