China’s Ministry of Natural Resources is launching a new surveillance drone network to monitor strategic parts of Chinese maritime claims in the South China Sea.
China already has a well-developed satellite surveillance system for oceanic areas, including the South China Sea, and it intends to augment it with additional investments in satellite coverage over the next several years. Its new Hainan satellite constellation will soon have ten satellites with optical and radar sensor packages focused on the contested region.

To see more about it : Maritime Executive