The key lesson here for states is only ever acquire financial obligations in your own sovereign currency. This is why the Swiss were able to put a ceiling on the value of the CHF during the European Debt Crisis. Their ability to spend CHF is unlimited, so they could just keep expanding their balance sheet indefinitely buying Euros, which devalued the CHF. A sovereign can always devalue, but not necessarily do the opposite.
[1] https://www.lrb.co.uk/v14/n19/wynne-godley/maastricht-and-al...