Japan and the United States are now “the most trusted allied nations,” Japanese Prime Minister Sanae Takaichi said Saturday following a 20-minute phone call with President Donald Trump.

President Trump contacted Takaichi shortly after meeting with Xi at the White House and gave her a detailed account of his discussions with the Chinese president, according to Takaichi’s office.

The two leaders discussed issues involving China, including economic security and broader security concerns. They also reaffirmed close cooperation between Tokyo and Washington.

Takaichi pointed to the frequency of her recent discussions with Trump as evidence of the strength of the alliance. The leaders met in New York on Sept. 22 on the sidelines of the United Nations General Assembly before speaking again on Saturday.

During their New York meeting, Trump and Takaichi agreed to further cooperation involving artificial intelligence, semiconductors, critical minerals, economic security and defense. They also discussed challenges involving China and the broader security environment in the Indo-Pacific.

The latest conversation came as Tokyo closely watches U.S.-China relations following Trump’s meeting with Xi. Takaichi said Japan and the United States would continue working together to promote peace and stability in the region and around the world.

The United States and Japan maintain a formal military alliance, with roughly 50,000 U.S. troops stationed in Japan under the countries’ security arrangements.