. >> reporter: this is the former headquarters of the sbu. that's the secret police, effectively, of ukraine. now, it was hit right at the beginning of the war with an air strike. clearly from the russian perspective, this is an immediate necessity to knock out the sbu's capacity here in kramatorsk because it is from this location that the counterintelligence operation would have been run. >> translator: we've been working on him for about four days. we have a complete picture of his actions. >> reporter: this is ukraine's most secretive force, the equivalent of the fbi and then some. sergey says, we have identified a person who, according to our intelligence, is committing a crime. simply put, this is a person who transmits to the russian side. the russian military, information about the locations of our units. they have orders to grab an alleged russian spy. the sbu says the spies feed information to russia's aircraft and artillery. in this region, the sbu says it catches one or two agents run by russia every day. and today's suspect is bei

in this region, the sbu says it captures one or two agents run by russia every day. and today's suspect is being watched. he's ours, there he goes. having a smoke. all units, green pants, black sweatshirt. special forces sweep in. resistance. two ukrainians are asked to witness the interrogation. with our camera present, protocols are followed to the letter. he's told why he's arrested for high treason during martial law and confesses on the spot to spying. he said he was allegedly recruited online, gets orders from a messaging app by someone called nikolai. the suspect got about $10 for alleged spying which included locations of military units in the town. according to an alleged exchange between he and his handler, the suspect was arrested midmission. >> reporter: there's no death penalty for traitors here but as he's driven through these gates, he'll know if tried and convicted, he could spend a lifetime behind bars, serhiy's hometown is under constant russian bombardment, so for him this is know small victory. russia is hitting us with missiles, rockets and air r

in this region, the sbu says it captures one or two agents run by russia every day. and today's suspect is being watched. he is ours, there he goes, having a smoke. all units, green pants, black sweat shirt, 1,000. special forces sweep in, resi resistance -- two ukrainians are asked to witness the interrogation. with our camera present, protocols are followed to the letter. he is told why he is arrested for high treason during martial law and confesses on the spot to spying. he said that he was allegedly recruited online, gets orders via a messaging app from someone call called nicolai. he got about $10 for the spying. according to an alleged exchange between him and his handler, the suspect was arrested mid mission. there is no death penalty for traitors here, but as he is driven through the gates, he knows if tried and convicted, he could spend a lifetime behind bars. this hometown is under constant bombardment, so for him this is no small victory. russia is hitting us with missiles. and people die in these attacks. and the more atrocities the russians commit, the

. >> in this region, the sbu says it catches one or two ages run lie russia everyday. and today's suspect is being watched. he's out having a smoke. >> all units go down. >> redsiresistance. two ukrainians are asked to witness the interrogation. without our camera present, protocols are followed. >> he's told my he's arrested for high trfree son. he said he was allegedly re recruited online and gets orders and the suspect got about $10 from his alleged spying. >> it includes the military unit in the town. according to an asedged exchange. the point-to-point was arrested. >> there is no death penalties for traitors here. as he driven through these gates, he could spend a life behind bars. his hometown is under constant russian bombardment. for him, this is no small victory. >> russia is hitting us with russia and missiles. people die in these attack. >> soldiers and sifrcivilians. >> the more atrocity and harder it is getting for the kremlin. >> sam kiley, cnn. >>> they call north korea, the hermit for a reason. once we come back, there is a lot of testing so the realit

. >> this is the former headquarters of the sbu. that's the secret police effectively of ukraine. now, it was hit right at the beginning of the war with an air strike, clearly from the russian perspective this is an immediate necessity to knock out the sbu's capacity here in kramatorsk, because it is from this location that the counterintelligence operation would have been run. >> translator: we have been working on him for about four days, we have a complete picture of his actions. this is ukraine's most secretive force, the equivalent of the fbi, and then some. he says we have identified a person who, according to our intelligence, is committing a crime. simply put, this is a person who transmits to the russian side. the russian military, information about the locations of our units. they're snatch teams with orders to grab an alleged russian spy. spies stream information on troop movements and details of targets to russia's aircraft ans today's suspect is being watched. he's ours, there he goes. having a smoke. all units, green pants, black sweatshirt, 1,000. special forces swe