MOSCOW (AP) — A Russian man went on trial Thursday on charges of high treason for a video he had allegedly sent to Ukraine's security services, the latest in a growing series of espionage cases involving the conflict.

The Volgograd District Court began hearing a new case against Nikita Zhuravel, who is currently serving a 3 1/2-year sentence for burning a Quran in front of a mosque.

The new charges are based on allegations that Zhuravel filmed a trainload of military equipment and warplanes in 2023 and sent the video to a representative of Ukraine’s security agency. He could be sentenced to life in prison if convicted.

Rights activists say Zhuravel is a political prisoner who was beaten while in custody.

While in pretrial custody before his first sentence, Zhuravel was beaten by the 15-year-old son of Ramzan Kadyrov, the Kremlin-appointed strongman leader of the mostly Muslim region of Chechnya. The elder Kadyrov posted the video on social media and praised his son, causing public outrage. He later awarded his son with the medal of “Hero of the Republic of Chechnya.”

Federal authorities have refrained from any criticism of the Chechen strongman.

Separately, a military court on Thursday sentenced to 24 years in prison a man convicted of treason and terrorism for setting fire to a military recruitment office in Moscow. Prosecutors said Sergei Andreev committed the November 2023 attack on instructions from the Ukrainian special services that he received on a messaging app.

Treason and espionage cases have skyrocketed after President Vladimir Putin sent troops into Ukraine in February 2022. The cases have targeted a wide range of suspects, from Kremlin critics and independent journalists to scientists, drawing attention from rights groups.

The legal definition of treason has been expanded to include providing vaguely defined “assistance” to foreign countries or organizations, effectively exposing to prosecution anyone in contact with foreigners.