Former sailor coordinated attacks on Odesa at FSB's request. He was detained by SSU

"The Security Service of Ukraine’s Military Counterintelligence Unit detained another Russian agent in Odesa. He turned out to be a former merchant marine who, after retiring, began collaborating with the FSB and directed shelling of the city. Russian intelligence service recruited the former sailor after he was discharged from the ship. To recruit the man, the FSB used an acquaintance of his—a former police officer from Odesa who had moved to Russia." UN