From historical point of view the variants needed are:
Yak-1/3 family:
Yak-1
Yak-1b
Yak-3 would be a nice bonus but not a necessity. The later war Soviet fighters are well covered already.
Yak-7/9 family:
Yak-7
Yak-7b (later low back version)
Yak-9
Yak-9D
Yak-1/3 line of fighter is still totally missing from AH. Soviets had three first line fighter families: Lavotchkins, Yak-1/3 and Yak-7/9 -series. All were massively produced. I think it's hard for anyone to imagine a situation where lets say USAAF would totally be one of its three first line fighter familes (P-38, P-47, P-51). That's the state where VVS planeset is currently in.