"Both sides were supposed to release all their prisoners, those were unconditional. There was some prisoner release that took place but it's not been satisfactory"

This quote by Warren Christopher is referring to a detainee exchange in between two sides. Both sides were supposed to release all of their detainees without any conditions, nevertheless, the detainee release that took place was not acceptable. This might imply that one side did not launch all of their detainees, or that the detainees that were launched were not released in a prompt manner. It might also mean that the prisoners were not released in the exact same numbers, or that the detainees were not launched in the same way. Whatever the case, the detainee exchange was not satisfying, and this quote is a tip that both sides require to meet their commitments in order for the exchange to be effective.