Яковлев Як-141-Yakovlev Yak-141; NATO reporting name “Freestyle”, the world’s first supersonic VTOL (vertical take-off and landing) aircraft.
Unlike the Harrier, and like her predecessor, the subsonic Yak-38, she used a pair of lift engines to help in vertical operations, which would hinder her performance to a certain degree, as said engines would remain a dead weight after horizontal flight was achieved.
Her development was cancelled with the collapse of the Soviet Union, and curiously enough, the lessons learned from her helped Lockheed into developing their own XF-35, after a brief partnership with Yakovlev in the early-nineties.
Isn't the irony just delicious? First the layout of the F-35 was inspired by a Russian design. Second the USMC pushed for the X-35 instead of the X-32 because they thought that heating issues would be much less for this layout...and last Lockheed Martin did a brief partnership with Yakovlev and then dumped them once they had all the info they needed to proceed alone, kinda like they did with Patria with regard to the ACV contest!