The German invasion of France in 1940 fails. By 1942 the war is going badly for Germany and Stalin decides the time has come to switch sides. Come the middle of 1943 the USSR has completed its military reforms and the Third Five-Year Plan. It also has the industrial areas of Silesia and Austria/Czechia, which for the sake of argument were captured relatively intact. On 22 June the Red Army smashes into Anglo/French-occupied Germany. What follows?