Taiwan's coast guard held drills with the military on Sunday to better practice joint operations in the face of what the government in Taipei says is a growing "gray zone" threat from China, which claims the island as its own territory.
Democratically governed Taiwan has repeatedly complained about activities such as undersea cable cutting and sand dredging by China around the island, designed to pressure it without direct confrontation.
It is often Taiwan's coast guard that scrambles first to respond.
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