Satellite imagery and AIS data show that at least three Chinese mobile drilling rigs have been active in the East China Sea near the median line with Japan, where Tokyo has protested Beijing’s oil and gas development.

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Beijing Keeps Busy in East China Sea Oil and Gas | Asia Maritime Transparency Initiative
China constructed two new oil and gas platforms in the East China Sea in May and June, drawing formal protests from Japan. But in addition to these new permanent structures, satellite imagery and automatic identification system (AIS) data shows that at least three mobile drilling rigs have also...
