Prime Minister Sanae Takaichi spoke over the telephone with U.S. President Donald Trump on Friday after his visit to China for talks with leader Xi Jinping, with Trump offering a ¡°detailed explanation¡± of the summit.

Takaichi told reporters in Tokyo that Trump had called her from aboard Air Force One, but declined to offer further details of their talks, saying only that the two had agreed to ¡°continue maintaining close communication¡± on issues facing the Indo-Pacific region.

She also said the two leaders had ¡°reaffirmed the unshakable Japan-U.S. alliance¡± and spoke about the war in Iran, adding that the two would aim to meet again during next month¡¯s Group of Seven summit in France.

Trump and Xi wrapped up a final day of talks in Beijing earlier Friday, as the U.S. president touted what he portrayed as economic wins at a summit that was overshadowed by Xi¡¯s warning of the possibility of conflict over Taiwan.

Speaking to reporters aboard Air Force One, Trump said that he had ¡°talked a lot about Taiwan¡± with Xi during the summit, but added that he had remained mum on the issue.?

¡°He does not want to see a fight for independence,¡± Trump said. ¡°I didn¡¯t make a comment on it, I heard him out.¡±

He added: ¡°On Taiwan he feels very strongly, I made no commitment either way.¡±

Xi delivered an unusually direct warning on democratic Taiwan during the first day of talks with Trump on Thursday, saying that the issue, if mishandled, could see the U.S. and China ¡°collide or even come into conflict,¡± according to a readout released by China¡¯s Foreign Ministry.

Taiwan has long been a point of contention between Beijing and Washington. China claims the island as a renegade province and has vowed to bring it under its control, by force if necessary. The U.S. does not have formal diplomatic relations with Taiwan, but is legally obliged to assist the island with its self-defense.

Japan had watched the Xi-Trump talks closely, with some former officials voicing concern that any U.S. policy shift on Taiwan would have profound effects for Tokyo and the region.

Sino-Japanese ties have plummeted to their lowest point in decades following Takaichi¡¯s remarks in parliament in November that the Self-Defense Forces could be deployed under the right to collective self-defense in ¡°worst-case¡± scenarios, such as a Chinese naval blockade of Taiwan, which the prime minister said would constitute a ¡°survival-threatening situation¡± for Japan.