late in WWII the japanese got a lot of german tech; jets, rockets, etc. & the japanese also got 7 different heinkels (the He 70, 74B, 112, 116, 118, 100 & 119) for testing, & at least a dozen He112, which may have been in combat in china...the real mistake is that the germans dont seem to have received any japanese aircraft. if they'd had zekes in the Battle of Britan as well as 109s it could have made a huge difference