Video: Four years on, Syria's brutal civil war shows no signs of abating

After 220,000 deaths and millions displaced, the fourth anniversary of the Syrian uprising brings little optimism.

The country remains divided among warring parties, split along both political and sectarian lines, with civilians caught up in the middle.

While repeated attempts at negotiation have failed, some have suggested that a previous demand from the US that President Bashar al-Assad step down prior to any transition of power, might be put to one side in the interests of stability.