>What happens when China or Russia decides to stay a massive empire and starts conquering your microstates?

Coordinated Defense pacts are already a thing. Like are you worried that these micro states wont want to join NATO?

And before you get weird, 5 + 5 + 5 is the same as 15. Theres no reason to imagine smaller militaries per capita.

>What happens when state A allows the dumping of pollution that flows into state B?

Man they might need to communicate on that one hey.