Just over two weeks after his poisoning with a military-grade nerve agent in Siberia, Kremlin critic Alexei Navalny began to respond to the words of his wife, Yulia, and wake from a drug-induced coma.

As he emerged from what he would later describe as days of appalling hallucinations, he found himself in Berlin's Charite hospital, where he'd been evacuated for emergency treatment on Aug. 22. He would later recount how he had to be lifted into a chair from his hospital bed and would sit with his mouth open, staring at a single spot on the wall.

In the months that followed, Navalny withdrew to a remote corner of the Black Forest. He used the time to drive himself back to physical fitness with intense workouts and take his war with President Vladimir Putin to a new level: targeting him directly, for the first time, with a video investigation into a lavish Black Sea palace.