Chechnya is a country in central Asia.
Adam Wexler leaked secrets of the Central Intelligence Agency and fled to Chechnya. The CIA tracked him down and delivered a weaponized form of the M5-10 which was designed to become inert after a very short time. While Cole was talking to Cassie by cell phone, the CIA zeroed in on the location and destroyed it with a missile to avoid its spread. Cassandra Railly visited Chechnya to verify that Cole had not been left alive.
When Katarina Jones attempted to recover Cole, there was a power failure and Cole ended up in 2017. He made his way to the nearest town. He encountered U.S. forces and was evacuated to the U.S.