A convoy of Kurdish Peshmerga troops departed from Turkey in a convoy overnight to help bolster Syrian Kurds holding out against self-styled Islamic State militants in the besieged town of Kobani.
Islamic State combatants have been trying to capture Kobani, known as Ayn al-Arab in Arabic, for over a month, pressing their assault despite U.S.-led air strikes on their positions and the deaths of hundreds of their fighters.
British jihadists returning to the UK from Syria after becoming disillusioned with the extremists could be used to dissuade others from going to join the conflict, William Hague said.
The Leader of the Commons said authorities would be prepared to assist former-fighters, if satisfied as to their "good intentions".
His comments come amid reports that some Britons who left groups like Islamic State (IS) fear returning home in case they face arrest.
Speaking on BBC1's The Andrew Marr Show Mr Hague said:
Satellite images have revealed the destruction in and around the town of Kobani, on the Syrian border.
Members of a prominent motorcycle gang from Holland have reportedly joined forces with Kurdish troops in Iraq to fight IS militants.
The sister of a UK journalist being held by Islamic State militants has appealed for his captors to reopen dialogue aimed at freeing him.