“…Except for the prohibition of arbitrary deprivation of nationality as part of human rights law, 81 and the adoption of two conventions on defining and reducing statelessness, 82 citizenship essentially remains within the sovereign domain of states and international law's leverage remains weak. 83 At the same time, citizenship and mobility -two areas of varied state practice -are related in complex ways and in a range of scenarios. Citizenship determines one's access to mobility (with different passports carrying varying weight).…”