Read enough UN statements and the same themes recur. This independent primer introduces the major multilateral files — the recurring subjects around which coalitions form, resolutions are drafted, and diplomacy is measured. Each links out to authoritative sources for deeper study.
Non-proliferation and disarmament
Few issues are older or more fraught than the effort to control weapons of mass destruction. At its centre sits the Nuclear Non-Proliferation Treaty (NPT), which binds its parties to prevent the spread of nuclear weapons, pursue disarmament, and share peaceful nuclear technology. The debate plays out in the General Assembly's First Committee and in periodic review conferences, where regional proposals — such as a Middle East free of weapons of mass destruction — are perennial. The UN's Office for Disarmament Affairs tracks the machinery.
Counter-terrorism
Since the early 2000s, counter-terrorism has become a permanent fixture of the UN agenda. The Organization has built a dedicated architecture — a coordinating office, an executive directorate serving the Security Council, and a global strategy adopted by the General Assembly — to help states cooperate on prevention, law enforcement, and addressing the conditions that let terrorism spread, all while respecting human rights and the rule of law.
Climate change and the environment
Climate change is the archetypal problem no state can solve alone. Under the UN Framework Convention on Climate Change, the annual Conference of the Parties (COP) negotiates global responses, from the Kyoto Protocol to the Paris Agreement. The issue threads through the Assembly's Second Committee, ECOSOC, and the Sustainable Development Goals, making it a test case for whether multilateralism can match the scale of a shared threat.
Humanitarian access
When conflict or disaster strikes, the UN's humanitarian agencies — for refugees, children, food, and coordination of relief — work to reach those in need. The central diplomatic challenge is access: negotiating safe passage for aid across front lines and borders. Funding appeals, protection of civilians, and the safety of aid workers are constant themes in Security Council open debates and General Assembly resolutions alike.
The Sustainable Development Goals
Adopted in 2015, the seventeen Sustainable Development Goals (SDGs) set a shared agenda to 2030: ending poverty and hunger, ensuring health and education, advancing equality, and protecting the planet. They succeeded the earlier Millennium Development Goals and now frame much of the UN's economic and social work. Progress is reviewed each year through ECOSOC's high-level political forum. Explore them at sdgs.un.org.
Peacekeeping and the protection of civilians
Where prevention fails, the UN's most visible instrument is peacekeeping: multinational contingents of troops, police, and civilian staff deployed under a Security Council mandate to monitor ceasefires, protect civilians, and support political settlements. Peacekeepers wear the pale-blue helmet and answer to the UN, not to their home governments, and operations are funded collectively through assessed contributions. Modern mandates are increasingly complex, blending security with human-rights monitoring, humanitarian support, and help in organising elections. The protection of civilians has become a central benchmark against which missions are judged — and a recurring theme of Security Council open debates. You can follow current operations through UN Peacekeeping.
Why these files matter
These issues are where the abstract machinery described elsewhere on this site meets real-world stakes. A country's diplomacy is largely the sum of the positions it takes across them and the coalitions it builds around each — a dynamic we illustrate in Saudi Arabia at the UN. To understand which body handles which file, keep our guide to the General Assembly's committees close at hand, and consult the glossary for any unfamiliar terms.