The phrase "foreign fighters" refers to individuals who leave their own country or nationality to join armed conflicts or wars in another country. Full definition
In addition to fieldwork in Turkish border towns, from where the vast majority of foreign fighters enter Syria, we have compiled the social media profiles of nearly 400 Western fighters in Syria and Iraq using the software platform Palantir. (newscientist.com)
Forget indoctrination, people become foreign fighters in Syria and Iraq for far simpler reasons: politics, persecution and peer - group pressure (newscientist.com)
World Watch Monitor has said called the attack a «clear agenda to wipe out» Christians which is being supported by foreign fighters and weapons. (premierchristianity.com)