Four other China-based North Koreans were placed under sanctions for allegedly working for other SANS firms, including Sim Kwang Sok, Kim Song Hun, Kang Chol Hak and Pyon Kwang Chol. The economic blacklistings come after North Korea announced Wednesday it had "successfully" conducted the final test-firing of its newly developed hypersonic missile, state-run media reported. The announcement came one day after the South Korean military said it detected Pyongyang firing a suspected ballistic missile into its eastern sea. After its release from the rocket booster, a hypersonic glide vehicle demonstrated "glide jump flight" and "corkscrew maneuvering" before hitting a target in waters 1,000 kilometers (621 miles) away, according to the North's news agency.