359th FG P51s bounced a bunch of LA5s and Yak 9s on March 18th, 1945 downing a number of Yak 9s without a loss. Stalin has the surviving Russian pilots shot and demands the Roosevelt do the same for the American pilots. Needless to say that didn't happen.
Much earlier, on November 7, 1944 the 82nd FG flying out if Italy in P38s accidently straffed a Russian convoy and shot down 3 Yak 9s, killing two of the pilots and killing a number of people in the convoy while destroying 20 vehicles. This was over Yugoslavia. Needless to say the Russians were not please nor were the Allied brass
Dan/Slack