Reuters reported that Chubais had left Russia and did not plan to return, also citing an unnamed source.
CNN is seeking comment from Chubais himself and has not independently confirmed that he has left Russia or the reason for his resignation.
Chubais had been in the environment job since December 4, 2020, TASS said.
He rose to prominence as Boris Yeltsin’s finance minister in the 1990s.
However, his supporters credit Chubais’s attempts to transition Russia’s economy into a free market.
In the early days of Putin’s rise to power, Chubais was considered an opponent by the now-president. Putin claimed in a series of interviews in 1999 that Chubais canceled the Kremlin job that he was initially offered.
In recent years, Chubais continued to call for economic reform and was one of the most high-profile liberals associated with the Russian government.