By the time Japan is able to extract and use that supply the trade war with China would be long over or one would hope so. The supply is several kilometers down

By the time Japan is able to extract and use that supply the trade war with China would be long over or one would hope so. The supply is several kilometers down. One would have to build a rig and then find a way to efficiently pump that material back up in large enough quantities for commercial usage (i.e. cheap enough to compete with China's supply)