“Japan is the threatened nation. Japan should act.”
Since WW2 Japan has not, per their constitution, been allowed an offensive military force. A great relief to their neighbors.
For some time they did not have a coast guard, the US took care of even that.
They now have a military that is small and defence oriented.
It would take an amendment to the Japanese constitution to build an offense oriented military.
Knowing the Japanese they probably have just such an amendment written and waiting for the proper time.
It is probably in the same envelope with the legislative bill to assemble the nuclear components they do not have to build the nuclear weapons they do not have. Yet.
YAWN, Trump. Wake me when you stop mouthing off. Either act or be quiet.