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I believe this is as much for North Korea’s ears as their own people’s ear.
The meeting is saying a couple of things such as there is no rift between America and Japan, it is also saying that they are taking the possibility of renewed warfare serious.
In other words, Trump is showing his cards and is calling Rocket man’s bluff. The same bluff he has used to get billions of dollars in the past.
I highly doubt that these plans would rise to the chief executive level. The details have been worked out much lower down, and Japan’s plan for evacuating her citizens is totally separate from the U.S. plans for evacuating hers. This is probably meant to create tensions in South Korea ahead of Trump’s visit.
Statesmen having serious adult conventions, unlike Obama diplomacy where his own ‘greatness’ overshadowed everything.