Sheik Hassan Nasrallah said European countries didn't think the fighters, thousands of whom have poured into Syria mostly in al-Qaida inspired groups, would return home. Most are from the region, but smaller numbers hold European citizenship.
"Many of them are alive, and some of them have begun returning to their first fronts in Europe, and other places. This is a threat to the security of Europe, international security, how will these countries deal with them?" he said, speaking via video link at a festival celebrating Israel's withdrawal from Lebanon in 2000.
The Syrian conflict began with largely peace protests in March 2011, although it has evolved into a civil war. Islamic extremists, including foreign fighters and Syrian rebels who have taken up hard-line al-Qaida-style ideologies, have played an increasingly prominent role among fighters.
European countries have scrambled to deal with the prospect of their nationals returning home from war in Syria.
The numbers of foreign fighters does not include those fighting on behalf of Assad including members of Iranian-backed Hezbollah, which has sent fighters to support Assad's troops. They were instrumental in helping Assad's forces dislodge opposition fighters from their strongholds along the countries' border, severing important supply lines and ultimately weakening chaotic rebels.
Syria's divided opposition has condemned the vote as a sham as the country enters its year of a conflict that has killed over 162,000 people.
As Nasrallah prepared to speak, Shiite neighbourhoods in Beirut erupted in celebratory gunfire. Tens of thousands of people turned out waving the bright yellow Hezbollah flag in the southern town of Bint Jbeil, where Nasrallah spoke on screens from an undisclosed location.
Also today, Lebanese security forces arrested radical Muslim cleric Sheik Omar Bakri Mohammed, the state news agency reported.
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