Days earlier, the veteran journalist had come out live on air as HIV-positive, a taboo-breaking revelation that drew responses from hundreds of Russians fighting their own lonely struggles with the virus. Now he’d been hacked.

“These were very personal messages,” Lobkov said in a recent interview, describing a frantic call to his lawyer in an abortive effort to stop the spread of nearly 300 pages of Facebook correspondence, including sexually explicit messages. Even two years later, he said, “it’s a very traumatic story.”

The Associated Press found that Lobkov was targeted by the hacking group known as Fancy Bear in March 2015, nine months before his messages were leaked. He was one of at least 200 journalists, publishers and bloggers targeted by the group as early as mid-2014 and as recently as a few months ago.