(Tribune News Service ) — The United Kingdom and Japan will allow military forces to be deployed to one another’s nations, as Tokyo expands bilateral cooperation with other U.S. allies amid concerns about China’s rise.

U.K. Prime Minister Rishi Sunak will sign a major defense agreement during a meeting Wednesday in London with his Japanese counterpart Fumio Kishida. The pact — the most significant deal of its type between the two countries in more than a century — will allow planning and delivery of larger, more complex military exercises, according to a U.K. government statement.

The U.K. becomes the first European country to have such an agreement with Japan, which has a similar deal with Australia. Japan’s cabinet recently approved the country’s biggest increase in defense spending since the end of World War II in 1945, updating its national security policy and describing China as an “unprecedented strategic threat.”

The shift by Japan, which has been constitutionally pacifist since the aftermath of the war, has been accelerated by Russia’s invasion of Ukraine. China has accused the U.S. and its allies of increasing the risk of conflict by attempting to knit together an Asian version of the North Atlantic Treaty Organization.

The Reciprocal Access Agreement with Japan also help deepen U.K. ties in Asia-Pacific. Sunak’s government is in the process of updating its approach to security, defense and foreign policy, which was last revised in 2021, with a tilt toward the region.

The agreement “is hugely significant for both our nations — it cements our commitment to the Indo-Pacific and underlines our joint efforts to bolster economic security, accelerate our defense cooperation and drive innovation that creates highly skilled jobs,” Sunak said in the statement. It comes weeks after Britain and Italy agreed to merge plans for a next-generation warplane with a parallel project in Japan, in a bid to bring a new fighter into service by 2035.

In November 2020, Japan announced a similar reciprocal security access agreement with Australia, allowing each nation to deploy military forces to the other for training and humanitarian missions, if necessary. In October, Kishida and Prime Minister Anthony Albanese met in Australia to sign a new security deal that strengthened ties.

The U.K. and Australia separately joined a wide-reaching security agreement with the U.S. known as “AUKUS” in September 2021, facilitating the sharing of technology and expertise to help Canberra build and deploy a fleet of nuclear-powered submarines by 2040. The U.S., which has stationed troops in Japan since the war, last year denied speculation that it had asked Tokyo to join AUKUS.

Bloomberg News writers Isabel Reynolds and Jon Herskovitz contributed to this report.

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