Mikhail Khodorkovsky, the former CEO of the Russian oil giant Yukos, used to be Russia’s richest man. In 2003, as he was increasingly criticizing Russian President Vladimir Putin, Khodorkovsky was arrested on fraud charges and spent a decade behind bars. Since being freed in 2013, Khodorkovsky has lived in exile and become one of Putin’s most prominent critics. He funds independent Russian news outlets, including the Investigations Management Center — the organization with which three Russian journalists were working when they were killed in the Central African Republic this week as they worked on a documentary about Russian mercenary forces.