The UN relies on cooperation with regional and subregional organizations 'now, more than ever' amid mounting global tensions and challenges, a senior official said on Friday in a briefing to the Security Council.

Elizabeth Spehar, Assistant Secretary-General for Peacebuilding Support, was speaking during a meeting on UN collaboration with the Collective Security Treaty Organization (CSTO), the Commonwealth of Independent States (CIS), and the Shanghai Cooperation Organisation (SCO) in maintaining international peace and security.