Would it work under Belgian law?

If so, it would come as surprise to me. But then, I am not qualified in Belgian law. Where Belgian law differs from our law it does so by having a `good faith' principle in contract.

And selling doses to other countries while being under contract to use their reasonable best efforts to deliver the due doses, doesn't sound not very much as a `good faith' interpretation.

I did not in the contract see where disputes would be settled, so I assume Belgium. If it legally matters I also noticed in the contract that AstraZeneca kept Astras old adress as the common adress, so AstraZeneca is incorporated in Sweden.