"Call me anytime" was the message Japanese Prime Minister Sanae Takaichi said she received from US President Donald Trump on Tuesday in their first phone call since Tokyo's leader sparked a major diplomatic bust-up with China.
Takaichi's off-the-cuff remark in parliament earlier this month that a hypothetical Chinese attack on Taiwan could trigger Japanese military action prompted a furious response from Beijing that has included a boycott on travel to Japan.
China claims Taiwan, which sits just over 100km (60 miles) from Japanese territory, and has not ruled out using force to take control of it. The island's government rejects Beijing's claim and says only Taiwan's people can decide their future.
Trump has not commented publicly on the dispute between Japan - a key US security ally - and rival superpower China, a silence that analysts say will be concerning to some officials in Tokyo.
In brief remarks following her call with Trump on Tuesday, Takaichi sought to dispel any concerns that the US president did not have her back.
"President Trump mentioned that he and I are extremely good friends, and that I should call him anytime," Takaichi told reporters.
Trump explained to Takaichi the recent state of US-China relations including his phone call with Chinese President Xi Jinping on Monday, she added.
Xi told Trump in that call that Taiwan's "return to China" is a key part of Beijing's vision for the world order, China's official Xinhua news agency reported.
Trump touted progress in trade talks and said relations with China were "extremely strong" in a post on Truth Social following his call with Xi. He made no mention of any discussions on Taiwan, however.
The White House did not immediately respond to a request for comment about Trump's call with Takaichi.
'Return' not an option
Taiwan Premier Cho Jung-tai said on Tuesday that for the island's 23 million people a "return" to China is not an option.
Japan's Chief Cabinet Secretary Minoru Kihara told reporters at a regular news conference on Tuesday that "the stability of US-China relations is extremely important for the international community, including Japan."
He declined to comment on Xi's reported remarks to Trump about Taiwan, which is surrounded by waters that provide a vital sea route for trade in goods and energy that Tokyo depends on.
Encouraged by the US, Japan has in recent years embarked on a historic military build-up to counter Beijing's growing might and assertiveness in the region.
Earlier on Monday, Beijing criticized Tokyo's plan to deploy a medium-range surface-to-air missile unit to Yonaguni, its island closest to Taiwan, calling it an attempt to "create regional tension and provoke military confrontation."
While Trump has not directly waded into the dispute between Japan and China over Taiwan, his ambassador to Japan, George Glass has said the US supports Tokyo in the face of China's "coercion."
Some officials in Tokyo have long worried that Trump may be prepared to weaken support for Taiwan in pursuit of a trade deal with China, a move that may embolden Beijing and spark conflict in East Asia.
"The Trump administration cannot be ruled out as one that might sacrifice the Taiwan issue for trade 'deals' with China," Seiko Mimaki, a professor specialising in US politics and diplomacy at Japan's Doshisha University, wrote in an editorial in the Asahi newspaper on Tuesday.
"In formulating policy towards China, it is essential to fully grasp these tendencies and risks inherent in the Trump administration," she added.
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