Yonaguni is the westernmost island in the Ryukyu chain, which would be a key strategic location in the event of a conflict over Taiwan.
The Japanese military has already spent years planning operations based on this precise scenario and although specific details have never been officially disclosed, past joint US-Japan exercises can help shed some light on their likely operational plan.
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Her comments triggered the ongoing diplomatic row with Beijing, which regards the remarks as interference in its internal affairs and has demanded she retract them.
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However, reports that the Japanese and US military were drafting a joint operational plan for a crisis in the Taiwan Strait first emerged in 2021, with media reports saying this would include the establishment of temporary offensive bases in the Ryukyu chain.
In the past two years, the frequency and scale of joint training exercises between the US and Japan have expanded significantly with a greater focus on specific scenarios.
