A German combat medic accused by Belarus of committing crimes including “terrorism” and “mercenary activity” has been sentenced to death by firing squad, according to a Belarusian rights group.

Rico Krieger, 30, was convicted under six articles of Belarus’s criminal code in a trial held at the end of June, the Viasna Human Rights Centre reported on Friday.

Part of the proceedings were held behind closed doors, the exact allegations against Krieger were not immediately clear and Belarus’s official news agency did not report anything about his case.

The case may be linked to the Kastuś Kalinoŭski Regiment, a group of Belarusian volunteer fighters fighting against Russia in the war in Ukraine, Viasna reported.