TODAY: UN says Russia attack on Syrian hospital a war crime, Russia denies responsibility; UN concerned about relations between Russia and Turkey, Turkey accuses Russia of using refugee outflows as a weapon; Syria ceasefire due to begin this week, Merkel says still no basis for lifting Russia’s Ukraine sanctions; Saudi Arabia and Russia outline tentative, ineffectual agreement to freeze production under certain conditions, oil price drops further; despite death threats, Kasyanov will not flee Russia.