Syria's two largest opposition groups have signed a draft agreement to unite against President Bashar al-Assad, and to establish democracy.

The document signed in Cairo on Saturday by the Syrian National Co-ordination Committee and the Syrian National Council will be submitted to a conference for opposition groups next month.

It calls for the protection of all civilians within international law and no foreign intervention.

Ashraf Al-Moqdad, a member of another Syrian opposition group, the Damascus Declaration, spoke to Al Jazeera from Cairo on the significance of the agreement.