Thus self-reliance is not the entirety of a secure economy, but merely the supporting structure. The secondary source of security is prosperity in other geographical locations. The more prosperous others are, the more likely they will come to your aid in times of trouble. The more they have to thank you for their prosperity, the more likely they will come to your aid. Again, merely being creditors to their debt is not enough.
Nations are sovereign, whether anarchist or authoritarian.
They can break their promises - they can ignore any legalistic claims to debt. It is the general goodwill that can be fostered between two nations or people that will be your salvation in case your own self-reliance fails. In the end, captial flight isn't really capital flight. They will require a lot of labor if they truly want to escape with real capital. What remains when the capitalists are gone are merely the people who are doing the work, and the means to do it.