Is there any escape from the duality of sovereignty conferred by international law and the age-old tensions between Grotian natural law ideas and Prosper Weil's strict positivism? What does your answer imply for the \"international legal system\"? Illustrate your answer with examples drawn from the treaties, cases and theorists that you have studied this semester. In particular, focus on treaties that have generated customary international law, and on the relationship between treaty and custom as sources of international law