Australia and Japan will sign a "historic" treaty that will further strengthen defense and security cooperation during a virtual leaders’ summit Thursday, in a move that could further inflame tensions with China.

The agreement is the first of its type for Japan other than with the United States, and marks a step closer in a relationship that is often referred to as a "quasi alliance.”

The signing of a Reciprocal Access Agreement will underpin greater and more complex practical engagement between the Australian Defense Force and the Japanese Self-Defense Force, Prime Minister Scott Morrison wrote in an emailed statement. The pact will provide a clear framework for enhanced interoperability and cooperation, he added.

"This treaty will be a statement of our two nations’ commitment to work together in meeting the shared strategic security challenges we face and to contribute to a secure and stable Indo-Pacific,” Morrison said.

Under Morrison’s watch, Australia’s relations with China — its largest trading partner — have nosedived in the wake of his government’s call in 2020 for independent investigators to enter Wuhan to probe the origins of the coronavirus. Beijing inflicted a range of trade reprisals, including crippling tariffs on Australian barley and wine, while blocking coal shipments.

Japan’s ties with China have also turned chilly over Beijing’s clampdown on Hong Kong and concerns are growing about tensions in the Taiwan Strait.

"We share with Australia the basic values of freedom and democracy,” Chief Cabinet Secretary Hirokazu Matsuno told reporters Wednesday. The two leaders plan to discuss matters of mutual concern at their virtual meeting, including national security, the economy and regional affairs, in a bid to strengthen bilateral ties and cooperation toward a free and open Indo-Pacific, he added.

The two countries had reached a basic agreement on the RAA in 2020 and had faced stumbling blocks, including concern that Australian troops found guilty of serious crimes could be subject to the death penalty in Japan.

Australia also signed a strategic defense pact last year with the United Kingdom and the U.S. that will enable the country to build nuclear-powered submarines, a move that China said would fuel an arms race in the region.

Cooperation under the new Australia-Japan pact also includes an expanding agenda for the Quad, which also includes India and the U.S., and a shared technology-led approach to reducing carbon emissions, Morrison said.

Prime Minister Fumio Kishida said Tuesday he had been seeking an in-person summit with Morrison, but had set the plan aside in order to focus on dealing with the latest surge in virus cases.

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