Fedor, also known as Skybot F-850, is a life-size, artificially intelligent robot sent into space by Russia. It is the first humanoid robot to be sent into space by Russia, and it was planned to carry out tests on board Expedition 60 Commander Alexey Ovchinin for two weeks before returning home in the first week of September.
The robot fired from Kazakhstan on Thursday Russian state news agency TASS reported that it was supposed to dock with the ISS aboard a Soyuz capsule on Saturday, but did not.
The live transmission of the docking to the Russian space agency Roskomos was interrupted with the Soyuz spaceship over 100 meters (109 meters) from the ISS, reported the news agency AFP.
"The spaceship is currently at some distance from the ISS, docking is planned for the reserve date, and the crew and the ISS are safe," Roskosmos told the Russian Space Agency in a tweet.
TASS later reported that the aborted docking may have been caused by a problem with an amplifier of a navigation system on the ISS.
Roskosmos confirmed that a new docking attempt would start on Monday.