An example: some English guys converted to Islam and fought against the UK in Iraq in favor of ISIS. How were they moved to the UK? bellow I wrote my idea, am I right? I need a legal basis for it.
I knew that detained persons in International armed conflict (IACs) could be moved to the third state under specific conditions. (Article 12 Geneva III). But I wonder whether the detained person (non-civilian) in transnational non-international armed conflict (NAIC) can be displaced to another country or not. And I knew that some ideas tried to apply analogy between IACs and NIAC to grant these detained persons, Prisoner of War status (PoW), or civilian status. But they were clearly fighting, and they can not belong to the civilian. And also, ICRC commentary explicitly wrote that there is no POW status in NIAC, and internment rules are minimal. I guess, there is a kind of gap here, and we can not fill it by the customary law. So the only way for us is using the potential of domestic law to move them from Iraq to the UK.