[Hierakares]

As we are talking about Russians that fought on the blue side: Not only before 1941 there were russian units fighting against the Allies. There was the so called "Russian Liberation Army" (Russkaya Osvobodityelnaya Armiya - ROA) fighting on German side until 1945. They had an own air force, flying even Me 262 (!).

Their marking looked like this:



Bf 109 with ROA markings:




Taken from this page with more information:

http://aces.safarikovi.org/victories/russia-roa.html