So, it always has to be enforced through gunboat diplomacy?

It sounds like a failed system, then - can we move over to some other economic model, that does not require coercion or a constant threat of war to function?

Unilateral coercion is not the basis for a free society, or free relationships between societies. It is utterly incompatible with sovereignty and democracy, and the ability of countries to decide their own internal policies.

No, it needs to be enforced by either a higher power (which doesn't currently exist for the world) or by not allowing countries to do this. This can happen either through gunboat diplomacy or by economic actions like the ones this entire thread is about.

As to your addendum, I am unaware of an economic model that intrinsically solves such problems of peaceful coordination between nation states.

The question is who is the actor with good faith though. The US is arguably the player with the most foreign aggressive interventions (often economic) since WW2. The US is all about free trade when it benefits them but the second that is no longer the case, it's over with fair free trade.