BEIJING (AP) — Taiwan President Tsai Ing-wen left Thursday on a tour of diplomatic allies in the Pacific that will end with a stopover in Hawaii.

Taiwan has struggled to shore up its dwindling roster of allies as countries are choosing instead to establish relations with Beijing, which considers the self-governing island part of Chinese territory.

Tsai will visit Palau, Nauru and the Marshall Islands, Taiwan's official Central News Agency reported.

The agency said she will transit through Hawaii on March 27 on her way back from the Marshall Islands, but did not give further details.

Only 17 mainly small, developing countries still recognize Taiwan as a sovereign nation. The island split from mainland China amid a civil war in 1949. Beijing has recently ratcheted up its rhetoric around "re-unifying" Taiwan with Communist Party-ruled mainland China.

China is particularly sensitive to cooperation between Taiwan and the U.S. When the latter approved the sale of $330 million of military equipment to Taiwan last September, China warned of "severe damage" to bilateral relations.

China's foreign ministry said Thursday that it has complained to the U.S. about Tsai's Hawaii stopover, mirroring its action toward a similar trip in 2017.

"Any attempt to create 'two Chinas' or 'one China, one Taiwan,' will be opposed by all Chinese people," ministry spokesman Geng Shuang said at a daily briefing. "We urge the U.S. to abide by the 'one China' principle ... and to not grant a stopover for Tsai Ing-wen, and to not send wrong messages to Taiwan independence forces."