On an early February morning, Russian opposition journalist and activist Vladimir Kara-Murza knew as soon as he awoke that he had been poisoned.
"I knew straightaway what it was because this was the second time in two years that this happened, and it began almost identically in the same way," he told NBC News.
Kara-Murza, an outspoken critic of the Kremlin and Russia's president Vladimir Putin, was rushed to a hospital in Moscow. Later, he was transferred to the U.S. for more treatment and recovery.
At the time of his most recent poisoning, Kara-Murza was promoting a documentary about his late friend, a fellow activist named Boris Nemtsov.
