U.S. space partnerships with Russia face ‘greatest challenge’ with Ukraine invasion, executive says
ISS Expedition 64 crew member, Russian cosmonaut Sergey Ryzhikov takes part in a training session at the Yuri Gagarin Cosmonaut Training Center in Zvyozdny Gorodok [Star City], Moscow Region. Anton Novoderezhkin | TASS | Getty Images For more than two decades, the space agencies of the United States and Russia have been partners through the…