why must you learn russian to be a austronaut

Question: why must you learn russian to be a austronaut
- Keywords:
  astronaut,
  learn,
  russian
Asked by GoldenPants to David on 17 Jun 2016.
- David Robertson answered on 17 Jun 2016:
  
  At the moment the only way to get the International Space Station is by a Russian rocket, and everyone in the rocket has to be able to help in controlling it so they have to speak Russian. Also the crew always has both US and Russian astronauts on board.

Question: why must you learn russian to be a austronaut