"China watching as US missile stocks drain over Iran" - Asia Times

Iran has officially transitioned its military architecture from US GPS to China’s Beidou, with the latter system also providing short message service, allowing Iranian command nodes to communicate even if local networks are down.

Iran has access to China’s encrypted, high-precision military signals that are resistant to Western jamming.

China uses its fleet of 500+ satellites to support Iran with signals intelligence (SIGINT) and help track US naval movements in the Persian Gulf.

China has focused on providing Iran with CM-302 supersonic anti-ship missiles and YLC-8B anti-stealth radar.