Yeah, Russia. About as cutting edge in medical science as Nigeria or Paraguay.You remember incorrectly. He had a paradoxical reaction to a benzodiazepine which led to akathisia. The benzo was for anxiety relating to at the time his wife's terminal cancer diagnosis ( which turned later out to be false and she was treated)
He was unable to get a successful remedy in North America so he was flown to Russia where he was put in a medically induced coma for treatment.
Never a drug addict as his detractors claim.