
US Secretary of State John Kerry attends his first Nato foreign ministers meeting on Tuesday, with Syria the main talking point as opposition fighters there come under intense pressure.
The one-day meeting at Nato’s Brussels headquarters comes as Assad appears to have made headway against the rebels - and after Iran, his close ally, said on Monday it wanted him to stay on and contest elections next year.
The Syrian Observatory for Human Rights said on Monday that elite fighters from the Lebanese Shiite group Hezbollah were leading the fight against rebels in the region of Qusayr in the central province of Homs.
Hezbollah, a staunch ally of the Syrian regime, is backed by Tehran.
On Sunday, Kerry announced a doubling to US$250 million of aid and non-lethal equipment for the rebels.
He urged other countries to follow suit amid sharp differences over the wisdom of providing arms, especially given the links some Syrian groups have with al-Qaeda.