Yak-3P
"Small,light, and agile, the russian Yak-3 was more than a match for Luftwaffe fighters" Yak-3 description. See F6F-Hellcat for stats info.
Yak-3 stats:
Speed: FFM
Agilty: FFFM
Armor: FM
Guns: FM
Yak-3D stats: (upgraded only)
Speed: FFF
Armor: FF
Yak-3P stats (upgraded only)
Speed: FFFM
Agility: FFFF
Guns: FFFM
The Yak-3 its unlocked by doing Coral Sea in Ace. Useful for Pearl Harbor to Marianas, not recommended for Ace missions.