Categories Articles Russia Says It Successfully Tested a Hypersonic Missile. But U.S. Officials Aren’t Worried Post author By crystalg Post date March 11, 2018 TIME Tags aren't, hypersonic, missile, Officials, Russia, Says, Successfully, Tested, U.S., worried ← Stormy Daniels on ’60 Minutes’ interview: ‘I guess we will see what happens’ → 5 people have died after a helicopter crashed into New York City’s East River