Song Kum Hyok is accused of masterminding a scheme in which North Korean cyber operatives posed as U.S. remote IT workers for unwitting companies.

The Wonsan Kalma resort was opened in a grand ceremony last month by North Korea's leader, Kim Jong Un, who hailed it as a "world-class tourist and cultural destination". The details of how this resort was built have been shrouded in secrecy in a country largely closed to the outside world.