We're live as the Security Council convenes for its annual open debate on the protection of civilians in armed conflict, with briefings from UN relief chief Tom Fletcher and the head of UN Women Sima Bahous. Ambassadors will discuss evolving threats, including use of heavy weapons and the rise of lethal autonomous killing machines such as drones. The UN has documented a sharp rise in deaths, with Gaza, Lebanon, Myanmar, Sudan and Ukraine among the hardest-hit. Mobile app users can follow here.