Thanks for all the comments!
@Hood
Doing all 36,000 of them would take like some 20 years (assuming 5 per day)... Nah... I'm not
that patient.
@Redhorse
Nice to see this little-known aircraft in FD scale.
And btw. if I really "had time", then this thread would be completed loooong ago.
@Novice
According to "Istrebitel Mustang. Vozdushnyi Kadillak" by Vladimir Kotelnikov (Eksmo, Moscow, 2010, p. 22-23), between December 1941 and May 1942 Soviet Union received from Great Britain 10 Mustang Mk.I (with Allison engines). They were trialled at NII VVS but Soviets didn't find them particularly well fitted to their needs (mind that Allison-equipped Mustangs had much different performance envelope than the later and more-famous Merlin-equipped variants - and for that reason RAF used them mostly in long-range recon and to lesser extent fighter-bomber role). In late summer 1942 3 of them were sent to 5 GIAP, but pilots for some reason didn't liked them and they made no operational flights at all. One Mustang ended up in VVS Academy at Zhukovsky, where it was used until 1946 and another one was tranferred to TsAGI.
Some more late-model Mustangs (10+) were abandoned in Soviet Union after the "shuttle missions", like Odysseus1980 mentioned above.