TOKYO (AP) — President Donald Trump begins one of his busiest days of his Asia trip on Tuesday, meeting with the new Japanese prime minister, speaking to U.S. troops aboard an aircraft carrier and mingling with business leaders.

Although Trump is visiting one of America’s most steadfast allies in Asia, there’s no shortage of uncertainty while he’s there. Sanae Takaichi, who became the country’s first female prime minister only days ago, must solidify her relationship with Trump while defending her country’s economic interests. Trump is trying to nail down $550 billion in Japanese investment as part of a trade deal that would reduce U.S. tariffs.

Takaichi is primed for a charm offensive, including a potential purchase of Ford F-150 trucks. Trump has often complained that Japan doesn’t buy American vehicles, which are often too wide to be practical on narrow Japanese streets.

Although Trump has focused his foreign policy toward Asia around tariffs and trade, he’s also speaking aboard the USS George Washington, which is docked at an American naval base near Tokyo.

Trump arrived in Tokyo on Monday, when he met with the emperor in a ceremonial visit. He was previously in Kuala Lumpur, Malaysia, where he participated in the annual summit of the Association of Southeast Asian Nations.

The gathering was an opportunity for Trump to celebrate an expanded ceasefire agreement between Thailand and Cambodia, which skirmished along their disputed border earlier this year. Trump had pressured them to stop fighting by threatening to withhold trade agreements.

There were also signs that tensions between the U.S. and China were cooling ahead of a planned meeting between Trump and Chinese leader Xi Jinping, which is expected to take place in South Korea later this week. Top negotiators from each country said a trade deal was coming together, which could prevent a potentially damaging confrontation between the world’s two largest economies.

Details were scarce, and it was unclear how much any agreement would resolve long-standing issues, or if it would return the relationship to the status quo before recent confrontations. China has restructured the export of rare earth elements that are critical for high-tech manufacturing, and Trump responded by threatening tariffs that even he admits would be unsustainable.

Trump is scheduled to leave Wednesday for South Korea, which is hosting the Asia-Pacific Economic Cooperation summit.

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Megerian reported from Seoul.