Japan expressed interest Tuesday in participating in the NATO command for its Ukrainian mission based in Germany in what would be a major boost in ties with the largely European alliance.

Japanese Defense Minister Gen Nakatani announced his country’s interest during talks with NATO Secretary General Mark Rutte in Tokyo. After providing the war-torn country with defense equipment and support, Japan now wants to join NATO Security Assistance and Training for Ukraine, or NSATU, headquartered at a U.S. base in the German town of Wiesbaden.

Details of the mission, including the possibility of sending any Japan Self Defense Force members to Wiesbaden, were still to be discussed. But any Japanese cooperation was not expected to involve combat, in line with what has been Tokyo’s post-World War II tradition of limiting its military’s role.

Nakatani said Japan wants to further deepen security cooperation with NATO and that participation in the NSATU mission would help Tokyo learn lessons from Russia’s invasion of Ukraine.

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Japan has said that Russia’s war on Ukraine underscores that security risks in Europe and Asia are inseparable, and Tokyo has sought closer ties with NATO while also joining the United States in expanding defense ties with other friendly nations in the Indo-Pacific.

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Japan considers China a threat in the region and has in recent years accelerated its military buildup, including preparing to acquire strike-back capability with long-range cruise missiles.

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NATO has stepped up its ties with Japan, South Korea, Australia and New Zealand, known as the IP4, in recent years, with their officials attending NATO ministerial and summit meetings.

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