China is taking further steps toward high seas boarding of fishing boats in the Pacific for the first time, risking tensions with Taiwanese fleets and U.S. Coast Guard vessels that ply the region, Pacific Islands officials said.

The Chinese Coast Guard demonstrated the capabilities of one of its largest ships, used to enforce maritime law in the Taiwan Strait, to Pacific Island ministers last week. It is also actively involved in debates on the rules of high seas boarding, according to documents and interviews with Pacific fisheries officials.

The fisheries officials said it was anticipated China will soon begin patrols in a "crowded" fisheries surveillance space.