How good was the soviet air force?

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Your scepticism is justified. However, 15 countries with different information policies represent the former USSR today.
The problem is that most of the Soviet WWII archives (including tons of documents from Germany and other countries) are in the Russian Federation. There was a golden period for researchers in the 1990s-2000s when many of those archives were accessible even to the common public but it's over now.
 

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