Elon Musk hit out at Dimitry Rogozin following the launch of SpaceX's Crew Dragon last week as the private rocket company of billionaire entrepreneur restarted an old feud. On Saturday, SpaceX launched two Americans into orbit from Florida en route to the International Space Station (ISS), a landmark mission that ended Russia's monopoly on flights there. NASA has had to rely on Russia's rockets to ferry astronauts to and from the space station.