Takaichi touched off the biggest diplomatic dispute with Beijing in years with comments in parliament this month that a hypothetical Chinese attack on Taiwan could trigger Japanese military action, inciting fury in Beijing.

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In Tuesday's telephone call with Takaichi, Trump said he did not want to see any further escalation, said the two Japanese government sources, who sought anonymity as the matter is a sensitive one.

Trump made no specific demands of Takaichi, however, one of the sources said, suggesting that he did not echo Beijing's call for a retraction of the comments. Japan has not offered one, saying instead that the remarks reflected longstanding policy.

Japan's Chief Cabinet Secretary Minoru Kihara declined to comment on the reports on Thursday.

Some officials in Tokyo have long worried that Trump may be prepared to weaken support for Taiwan in pursuit of a trade accord with China, a move that may embolden Beijing and spark conflict in East Asia.

"For Trump, what matters most is U.S.-China relations," said Kazuhiro Maejima, a professor of U.S. politics at Sophia University. "Japan has always been treated as a tool or a card to manage that relationship."

Trump's telephone call with Takaichi immediately followed another with Xi Jinping, in which the Chinese president said Taiwan's "return to China" was a key part of Beijing's vision for the world order, the official Xinhua news agency said.

Democratically governed Taiwan, which rejects Beijing's claim of ownership, saying only its people can decide the island's future, has ruled out such a return.
Trump has not commented on the reported discussions with Xi about Taiwan, stressing instead that the world's two largest economies enjoy "extremely strong" relations and are working to finalise a sweeping trade deal.