In practice, because of sovereignty, any state can withdraw from any treaty at any time. The question of whether this is permitted is really a question of how other states will react to the withdrawal; for instance, another state might impose sanctions or go to war over a treaty violation.
যদিও তত্ত্বগতভাবে কোনো চুক্তি থেকে সরে আসা হয়তো সম্ভব না-ও হতে পারে, তবুও কখন তা সম্ভব হতে পারে?
In practice