Germany was not alone when defeated on Eastern front. The axis troops consisted of Germans, Finns, Hungarians, Italians, Romanians, Bulgarians, Croats.
Wot, no Ukrainian Nazis in your list? You're slipping... Your list forgot many other nationalities: soldiers from Belgium, the Netherlands, Norway, Denmark, the Baltics, France, Poland, Spain, Portugal, plus something like a million people from various parts of Russia (estimates vary from 600,000 to 1,400,000), Georgians, Armenians, Tatars, Turkestanis, Arabs, etc. Either volunteers or conscripted.
Likewise, the Soviets were not alone when they defeated Germany and its allies. Apart from the copious amounts of hardware sent by their allies, there were contingents of fighters from various parts of Europe. In particular, there was a large contingent of Poles (330,000), Czechs, Slovaks, Romanians, and a squadron or two of Free French sent by De Gaulle (see the well-documented story of the Normandie-Niemen regiment: the French air force received the regiment's 37 surviving Yak fighter planes as a thank you from Staline after WW2).