I want to know the answer to the following question:
Which article of the Vienna Convention on the Law of Treaties provides that there is a presumption that treaties cannot be unilaterally denounced?
All the background I'm provided with is that "As obligations in international law are traditionally viewed as arising only from the consent of states, many treaties expressly allow a state to withdraw as long as it follows certain procedures of notification.". Is that enough to answer the question?
Answer: no