They need to default on their debt and not pay it.  Kind of like an individual would do for taxes, but as a whole country.  This is impossible if the primary currency being used is the same as the currency the debt is owed in.  

Converting to a bitcoin standard is just the beginning. After comes revolution by refusing to pay their US slave masters and refusing to pay the local fiat overlords.  

Once the people are free from the local and international debt burdens they will be able to sell their goods and services at fair global value without taxation (most likely illegally through open protocols like nostr). 

This is the long and difficult path to freedom, but the people will prevail.