I want to know the answer to the following question:
What two factors determine whether it is possible to withdraw from a treaty?
All the background I'm provided with is that "When North Korea declared its intention to do this the Secretary-General of the United Nations, acting as registrar, said that original signatories of the ICCPR had not overlooked the possibility of explicitly providing for withdrawal, but rather had deliberately intended not to provide for it.". Is that enough to answer the question?
Answer: no