Russia blocked a US-led UN resolution barring nuclear arms in space, amid US security concerns it is developing a nuclear space weapon.

U.S. Ambassador to the U.N. Linda Thomas-Greenfield asked what Russia was "hiding" by vetoing a resolution banning space nukes.

Russia on Wednesday vetoed a U.N. resolution sponsored by the United States and Japan calling on all nations to prevent a dangerous nuclear arms race in outer space, calling it “a dirty spectacle” that cherry-picks weapons of mass destruction from all other weapons that should also be banned.