Two Russian frigates and a submarine in the Mediterranean Sea targeted ISIS positions in Syria’s Hama province, Moscow said.
In the panel’s first meeting, 13 men took to the stage. The women were in another room, linked through video.
The mass grave near the city of Mosul could be among the militants’ largest.
The new push in Mosul comes after government forces finished clearing Islamic State from the east of the city last month.
Palestinians from 50 countries gather in Istanbul to discuss forming new political entity to represent their views.