[letku]

My proposals:

IL-4 = Pe-2
DB-3 series = Pe-2
Su-2 = IL-2 series 1 or Mig-3 1940
R-10 = IL-2 series 1 or Mig-3 1940
B6N2 = Ki-43 Ia
B5N2 = Ki-43 Ia
Ohka = BI-1