The case of the Irish woman who joined Isis shows us that citizenship is not just about a passport

The stated desire of Lisa Smith, the former Irish Air Corps officer who travelled to Syria in 2015, to now leave a refugee camp there and return to Ireland raises an important dilemma for the government.

Parallels can be drawn between the case of Smith and that of Shamima Begum, the British citizen who has expressed a desire to return to Britain having left in 2015 to marry an Isis fighter in Syria. ...