Anatoly Chubais, a prominent Russian liberal reformer of the 1990s, has quit his post as sustainable development adviser to President Vladimir Putin, the Kremlin confirmed Wednesday. A source close to Chubais told state news agency TASS that the 66-year-old, who has sometimes voiced criticisms of Putin’s actions, had left the country, while the Kremlin did not confirm this. “Chubais resigned according to his own desire. But whether he has left or not — that’s his personal business,” Kremlin spokesman Dmitry Peskov told RIA Novosti state news agency. Peskov did not give a reason for Chubais’s …