Tensions between Taiwan and China have risen to their highest level in decades, with China sending record-breaking numbers of fighter jets toward international airspace close to the island and stepping up a campaign of military harassment. Taiwan's Defense Ministry has said that China would have "comprehensive" capabilities to invade the island by 2025.

China claims Taiwan as part of its national territory, though the island has been self-ruled since it split from the communist-ruled mainland in 1949 after a long civil war.

Chiu has called the rising tensions between China and Taiwan the most "severe" he has seen in 40 years.

Taiwan's President Tsai Ing-wen said in an interview with CNN that aired Thursday that she was confident the U.S. would defend Taiwan if China made a move against the island.

Tsai also confirmed the presence of a small number of U.S. troops on the island to help train their Taiwanese counterparts.

Although the U.S. has no formal diplomatic relationship with the Taiwanese government, it has strong unofficial ties. Under the Trump administration, the U.S. stepped up weapon sales to Taiwan.

China's Ministry of Foreign Affairs spoke out against the confirmation of troops, saying it is "firmly opposed to any form of official contacts and military ties" between the U.S. and Taiwan and that no one should "underestimate the strong determination, firm will and strong capacity" of China to defend its sovereignty.

Last week, U.S. President Joe Biden seemingly contradicted the decadeslong U.S. policy toward Taiwan when he said the U.S. was committed to protecting the island if China attacked it.

The White House later said President Biden's comments did not represent a change in policy toward the island.

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