Western countries, Arab countries and Syria's new authority are all attending. We'll also have a special report from the areas of Syria affected by last week's massacres.

Also on the programme: the first official call between the US and Russia on the Ukraine conflict is confirmed to be taking place; and we hear the story of an art critic turned thief, whose theft of a painting by the Flemish artist Van Dyke has only just came to light thirty five years after his death.

(Picture: Syrian troops on top of a tank. Credit: Reuters / Al Masri)