Syrian President Bashar al-Assad's Lebanese ally, Hezbollah, has been fighting alongside Syrian forces.
The Shia Muslim group's stated policy is to prevent al-Assad's regime from collapsing. But it has paid a heavy political price for its involvement in the neighbour's conflict and is under increasing pressure at home.
Al Jazeera's Zeina Khodr reports from Beirut.
Source: Al Jazeera