Taiwan says China asserting fake jurisdiction over eastern waters

China's coast guard is harassing shipping with its latest patrol off Taiwan's east coast and trying to exert a fictional jurisdiction, the Taiwanese Coast Guard said, adding it had sent its own ships to keep watch.

China, which views Taiwan as its own territory, has stepped up activity off the island's east coast since June with regular coast guard patrols. Officials in Taiwan, which rejects Beijing's sovereignty claims, say they believe China is practising for a potential maritime blockade using overlapping military, paramilitary and civilian assets.

Taipei regards the area off its east coast as critical to wartime supply routes from allies in the event of a blockade or conflict. China recognises no claims of sovereignty by Taiwan.

Responding late Saturday to China's announcement of its latest east coast patrol, Taiwan's coast guard said two Chinese ships were involved and it had sent its own forces to monitor.