[Godslayer Jillian]

This is the reason I'm not a pacifist.
The Spanish anarchist regions, like Catalonia, the Asturias, and Aragon survived because they fought for the land.
We can also put Cuba as an example. They weren't anarchist, but the United States didn't overthrow Cuba even though they once became the highest threat of "the free world."
While Castro stayed to manage his nation, Che left to help communist uprisings all over the world, just like Trotsky would have liked.
This would also work with Anarchism, never attacking, but only defending, while still spreading the spirit of anarchism all throughout the world. Thanks to the globalization of information, and because in this scenario anarchism has proven to work in at least one region, many dissenters and, I'm willing to bet, a huge portion of intellectuals, would support the movement, making it hard for other countries to attack.
It would be like executing Chomsky on public television.