All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
In principle it is permissible for a Muslim to marry a woman from the people of the Book whether she is in a Muslim or in a non-Muslim country, and whether this is under a Muslim rule or a non-Muslim rule.
However, due to the disadvantages that may result from such a marriage –as you mentioned in the question –the scholars absolutely disliked it. If the woman is in a non-Muslim country, then this is even more disliked as more disadvantages are probable.