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In 1940 alone Soviet Union was supplying thousands of tons of strategic materials to the German military industry *bypassing* the economic blockade of Third Reich imposed by other countries.
https://en.wikipedia.org/wiki/German%E2%80%93Soviet_Commercial_Agreement_(1940)#Total_trade
The 1 May 1941 parade in Moscow actually had Nazi generals visiting as guests of honor https://www.youtube.com/watch?v=JZbN_ujVWKY
