A veteran Russian cosmonaut who was assigned to command the International Space Station in 2015 has unexpectedly resigned.

Cosmonaut Yuri Lonchakov tendered his resignation to the Russian federal space agency, Roscosmos, on Thursday. Russian news agencies, quoting the head of the Gagarin Cosmonaut Training Center, reported Lonchakov will be "formally discharged" on Sept. 14.

"He came and told me that he had found a better job than working in space," Sergei Krikalev, the training center's chief and the current record holder for most time in space by any human, told the Interfax news service. "Frankly, we were counting on him because he was not just in the unit, [but] he was assigned to a crew."

- Sergei Krikalev, chief of Russia's Gagarin Cosmonaut Training Center

Lonchakov was scheduled to fly as the commander of the Russian spacecraft Soyuz TMA-16M, launching in March 2015 with Roscosmos cosmonaut Mikhail Kornienko and NASA astronaut Scott Kelly, the space station's first two yearlong crew members. [Quiz: Do You Know the International Space Station?]

Once on board the orbiting laboratory, Lonchakov was set to join the Expedition 43 crew as a flight engineer before taking over command of the space station as the leader of Expedition 44 in May 2015. He was then to return to Earth in October 2015.

Lonchakov's replacement on the crew was not announced. Backing him up on the Soyuz TMA-16M crew was Alexei Ovchinin, a fellow Roscosmos cosmonaut.

Lonchakov, 48, joined the cosmonaut corps in 1997 and flew three spaceflights to the International Space Station. He first launched on NASA's space shuttle Endeavour as a member of the STS-100 crew in 2001, helping to deliver the Canadarm2 robotic arm during the 12-day mission.

The next year, he flew on board the first Soyuz TMA-class spacecraft, Soyuz TMA-1, for a 10-day flight to the space station.

Lonchakov's third and now final spaceflight began in October 2008 with the launch of Soyuz TMA-13, the 100th crewed Soyuz spacecraftto fly. Serving as an Expedition 18 flight engineer, Lonchakov spent 178 days in space, bringing his career total to 200 days (and 19 hours) off the planet.

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Russian Quits Space Station