Japanese troops will converge on California’s southern coast in the next two weeks as part of a military exercise with U.S. troops aimed at improving that country’s amphibious attack abilities.

U.S. and Japanese military officials said the unprecedented training, led by U.S. Marines and sailors, will help Japan’s Self-Defense Force operate in stronger coordination with the United States, its main ally, and better respond to crises such as natural disasters.

China may see it differently, however, given the tensions between Tokyo and Beijing over a long-running dispute concerning islands claimed by both in the East China Sea.

“It’s another dot that the Chinese will connect to show this significant expanding military cooperation,” said Tai Ming Cheung, an analyst of Chinese and East Asian security affairs and director of the Institute on Global Conflict and Cooperation at the University of California, San Diego.

China asked the United States and Japan to cancel the drill, scheduled to begin Tuesday, Japan’s Kyodo News service reported, citing unnamed Japanese government sources. The Japanese Defense and Foreign Ministries would not confirm whether China had made any request but said they are going ahead with the exercises.

The Chinese Foreign Ministry did not respond for comment on whether China requested a cancellation. In regard to the drill itself, Foreign Ministry spokesman Hong Lei said: “We hope the relevant sides can focus on peace and stability in this region, and do more to contribute to mutual trust and regional peace and stability.”

U.S. military officials said strengthening Japan’s amphibious capabilities is vital as the U.S. focuses more attention on developing an Asia-Pacific strategy amid ongoing U.S. Defense Department budget cuts. The region has been roiled by tensions because of North Korean long-range rocket and nuclear tests and maritime territorial disputes between China and its neighbors.

“If the 20th century taught us anything, it is that when democracies are able and willing to defend themselves it preserves peace and stability,” said Col. Grant Newsham, Marine liaison to the Japanese military. “Most Asian countries welcome — even if quietly stated — a more capable (Japanese force) that is also closely allied to U.S. forces.”

China recently asserted its dominance over what they call Diaoyutai, and Japan calls the Senkaku Islands, by sending government ships into Japanese territorial waters in April. China has said it is only safeguarding its sovereignty.

Japan’s navy is among the world’s best-equipped and best-trained, but its skills at storming beaches and other amphibious capabilities have been weak since its national defense force formed in the 1950s.

Largely in response to China’s growing military might — including the acquisition of its first aircraft carrier last year — Japan has been buying amphibious landing craft and beefing up training for potential conflicts in or around small islands. Japan is also repositioning its troops to better monitor and defend its southern borders and sea lanes.

The San Diego exercise marks the first time the country’s troops will travel aboard warships so far from home, and members of Japanese air, sea and ground forces will train together with the U.S. military, said Cmdr. Takashi Inoue, spokesman for the Japanese Self-Defense Force.

Japan is sending three warships, about 1,000 service members and about four combat helicopters to the so-called Dawn Blitz exercise, Inoue said. Forces from New Zealand and Canada also will take part.