I have a question about this, that I've never been able to find a good answer to: what happens if you unilaterally renounce US citizenship? Consider the situation: you're a dual US / Dutch citizen. You want to avoid paying US income tax (or just to avoid filling in a form each year that results in the IRS telling you that your tax bill is $0 because the Netherlands' tax rate is higher). But the State Department's ren…
They could prevent the Dutch banks transmitting your info, but they can do that regardless of your US citizenship.
The likely outcome is the Dutch court refuses to touch it. Even if you win, I don't think they'd touch your citizenship. They'd just refuse to extradite. They don't have to do what the US wants just because the subject is a US citizen.
The US is going to be infinitely more interested in preventing this than the Dutch are in allowing it though.