That's according to the SBU press center, Ukrinform reports.
"SBU counterintelligence operatives have exposed and detained in Vinnytsia region a Russian FSB asset who had been trained by terrorists in the temporarily occupied Donbas. The investigation established that the citizen of Ukraine in question had joined the illegal armed groups with the so-called ‘Luhansk People's Republic’ and taken part in hostilities against the Armed Forces of Ukraine. Also, he underwent in the occupied territory of Luhansk region combat training as part of a sabotage and reconnaissance group, led by a former FSB operative call sign Dykyi (Wild - ed.)," reads the statement.
It is noted that on the instructions of his Russian handlers, the FSB asset moved to a government-controlled region of Ukraine to perform intelligence tasks.
As part of the criminal proceedings, SBU detectives pressed treason and terrorism charges against the detainee.
The court is yet to rule on a measure of restraint to be applied to the suspect.
Further pre-trial inquiry is underway.
The SBU has carried out the raid under the procedural guidance of the Vinnytsia Regional Prosecutor's Office.
Photo from the SBU