Secretary of Defense Pete Hegseth wrapped up his first official visit to the Asia on Sunday by offering reassurances to Japan that President Trump wants a stronger military alliance in the region to deter an increasingly assertive China.

Following an 85-minute meeting in Tokyo with his Japanese counterpart, Mr. Hegseth said the Trump administration would abide by promises to increase security cooperation with its staunch ally. This would include speeding up a Biden administration-era plan to create a new joint U.S.-Japan military command in Tokyo that he called a “war-fighting headquarters,” although Mr. Hesgeth did not say when it would become operational. He also said there would be more joint military exercises in the Okinawa, islands near Taiwan, a self-ruled island that China says is part of its territory and has threatened to take by force.

Mr. Hegseth arrived in Japan from the Philippines, another U.S. ally, where the defense secretary also sought to allay anxiety about the Trump administration’s commitment to the region. Japan has watched with concern as the United States has broken with traditional allies in Europe to seek a deal that might allow Russia to keep territory seized from Ukraine.

U.S. Marines training on the Japanese island of Okinawa.Credit…Chang W. Lee/The New York Times

Japanese officials have worried in private that such concessions might encourage China to make a move on Taiwan. After the meeting with Gen Nakatani, the Japanese defense minister, Mr. Hegseth struck a strident tone about the alliance, proclaiming that the United States would work with Japan to secure “peace through strength” that will deter the Chinese from taking action.

“America first does not mean America alone,” Mr. Hegseth told reporters. “America and Japan stand firmly together in the face of aggressive and coercive actions by the communist Chinese.” Mr. Hegseth did not address concerns about his sharing of military information on the Signal chat app that included a journalist.

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