Factual error: When Yuri's daughter is getting away from the hotel tower, she has to walk to the next building located in front of the tower's window to take the chopper. It should take several minutes, but she does it in a few seconds. (00:48:25)
Factual error: It is not plausible that the tail rotor blade of the helicopter can destroy large parts of a building without being damaged. (01:24:40)
Factual error: The nuclear power plant at Chernobyl is located 4 km from the town of Pripyat, which is located in a forested area, and the plant is not visible from the town - in this movie it's clearly in visual range.
Factual error: In the ballroom scene, John, and friend hide behind a bar while the bad guys are shooting at them. The bullets would gone right through the bar's bottom cabinet as it's made of wood, which does not offer protection against bullets.
Answer: His name was Anton. He was an associate of Viktor Chagarin. Jack, although lying, said Yuri Komarov sends his regards. Chagarin and Komarov were former partners and Chagarin was the one who got Komarov put in jail. By Jack saying Komarov sent him, it made it seem like Komarov was out for revenge on Chagarin (by attacking his associates). The courts offered to reduce Jack's sentence for testifying against Komarov, which allowed Jack to get close to him and help him escape.
Bishop73