TOKYO (AP) — Japan expressed concern after a Chinese navy destroyer conducted live-fire drills off a remote Japanese island in the Pacific Ocean on Sunday during its joint exercise with Russia, officials said Tuesday.

The Chinese Luyang III-class guided-missile destroyer conducted a live-fire exercise off Japan’s southernmost island of Okinotori, hours after the Japanese navy spotted it operating alongside two other Chinese warships and a Russian frigate, the Japanese Joint Staff said.