Russia’s Federal Security Service (FSB) has learned to intercept messages sent by Russians to bots or feedback accounts associated with certain Ukrainian Telegram channels, potentially exposing anyone communicating with such outlets to treason charges, Russian human rights NGO First Department warned on Friday.

Russia’s principal domestic intelligence agency has gained access to correspondence made with Ukrainian Telegram channels including Crimean Wind and Vision Vishnun, according to First Department, which said that the FSB’s hacking of Ukrainian Telegram channels had come about during a 2022 investigation into the Ukrainian intelligence agencies “gathering information that threatens the security of the Russian Federation” via messengers and social networks including Telegram.

The case is being handled by the FSB’s investigative department, though no suspects or defendants have been named in the case, according to First Department.

When the FSB identifies individual Russian citizens who have communicated with or transmitted funds to certain Ukrainian Telegram channels, it contacts the FSB office in their region, which then typically opens a criminal case for treason against the implicated person.

“We know that by the time the defendants in cases of ‘state treason’ are detained, the FSB is already in possession of their correspondence. And the fact that neither defendants nor a lawyer are named in the main case allows the FSB to hide how exactly it goes about gaining access to that correspondence,” First Department said.