From The New York Times:
China accused Japan and the United States on Sunday of meddling in its internal affairs, and criticized a new joint security statement in which the two countries declared a peaceful Taiwan Strait as among their “common strategic objectives.”
The mention of Taiwan in the statement issued Saturday by senior American and Japanese officials drew a firm response from China, which considers Taiwan a breakaway province and is acutely sensitive to what it regards as outside interference. By contrast, Taiwan’s foreign minister cautiously welcomed the statement.