Indonesian Foreign Minister Retno Marsudi (L, Front) addresses a UN Security Council open debate on "Investing in Peace: Delivering Quality Training and Capacity Building to Improve Safety and Security and Performance of UN Peacekeepers" at the UN headquarters in New York, on May 7, 2019. UN Secretary-General Antonio Guterres said Tuesday that training is a necessary and strategic investment in peacekeeping. (Xinhua/Li Muzi)