TSC Insights: The Legacy and Evolution of Foreign Fighters in Syria

The fall of the Assad regime in December 2024, following the launch of the “Deter Aggression” campaign by Hay’at Tahrir al-Sham (HTS) and allied opposition factions, marked a turning point in Syria’s conflict and the role of foreign fighters within it. As the war shifted, so too did the presence and influence of tactical units made up of foreign fighters – groups that have since played a critical role in reshaping modern militant strategy in the region. Now, as the Trump administration announced following the president’s recent meeting with Syrian interim President Ahmad al-Sharaa in Saudi Arabia, as the U.S. is set to relieve sanctions on Syria, President Trump urged al-Sharaa to “tell all foreign terrorists to leave Syria.” This step, however, if implemented, could potentially cause immense challenges for Syria for several reasons, not least of which is that some of these foreign fighters have already been given high-ranking military positions in the country’s new armed forces.

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