Britain, France and Germany raised the alarm on Wednesday over recent Chinese activities off the east coast of Taiwan, where China has mounted coast guard patrols, saying they threaten regional stability and freedom of navigation.
China, which views democratically governed Taiwan as its own territory, earlier in June sent coast guard ships into the waters off the island's east coast for what it called a "special maritime traffic law-enforcement operation", angering Taipei.
China said the operation was in response to Japan and the Philippines, saying they would begin formal talks on their maritime boundaries, which Beijing viewed as involving Chinese waters off Taiwan.
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China has also been sending maritime survey ships into the same waters.
"We have noted with concern novel Chinese activity in the waters east of Taiwan," the de facto British, French and German embassies in Taipei said in a rare joint statement.
"These actions threaten regional stability and the freedom of navigation and safety of international shipping. We reiterate our opposition to any unilateral change to the status quo, particularly by threat or use of force or coercion," they said.
"It is fundamental that all navigational rights and freedoms and the safety of seafarers and vessels are guaranteed and respected."
China's foreign ministry did not immediately respond to a Reuters request for comment.
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Britain, France and Germany, like most countries, have no formal diplomatic ties with Taiwan. But like many Western countries, they have repeatedly voiced concern at Chinese pressure against Taiwan, whose government rejects Beijing's sovereignty claims.
