MOSCOW, March 31. /TASS/. Russian security structures know who masterminded terrorist attacks against Russia and will do everything necessary to punish them, Russian Federal Security Service (FSB) Director Alexander Bortnikov said in an interview with journalist Pavel Zarubin, who published a video on his Telegram channel.

"There are those who went and organized combat units. There are those who intended to do so. All law enforcement and security services are actively working on this. And, as the president said, we know the names of masterminds behind plotting and carrying out terror attacks on our soil," he said. The FSB chief stressed that everything will be done in order to catch and punish the perpetrators.

On March 19, Russian President Vladimir Putin tasked the security service with detecting and punishing the traitors who committed crimes against Russia.