The General Assembly First Committee addresses the disarmament of conventional weapons, weapons of mass destruction and related international security questions. The First Committee makes recommendations on the regulations of these weapons as they relate to international peace and security. The First Committee does not address legal issues surrounding weapons possession or control complex peace and security issues addressed by the Security Council.

General Assembly Third Committee 

The General Assembly Third Committee focuses its discussions on social, humanitarian and cultural concerns that arise in the General Assembly, although its work often overlaps with that of other United Nations organs, including the Economic and Social Council and its subsidiary bodies. Human rights, education and cultural preservation are typical issues for the Third Committee. Notably, the Third Committee would not discuss the legal implications of human rights matters, as those are discussed by the Sixth Committee, nor would it call for special studies or deploy monitors, as those tasks are handled by the Human Rights Council. The Third Committee also adheres to the purview guidelines of the General Assembly as a whole.

Website: https://www.un.org/en/ga/third/
Combined document of topics/topic guide: Click here 

Security Council 

Under the Charter, the Security Council has primary responsibility for the maintenance of international peace and security. It has 15 Members, and each Member has one vote. Under the Charter, all Member States are obligated to comply with Council decisions.

The Security Council takes the lead in determining the existence of a threat to the peace or act of aggression. It calls upon the parties to a dispute to settle it by peaceful means and recommends methods of adjustment or terms of settlement. In some cases, the Security Council can resort to imposing sanctions or even authorize the use of force to maintain or restore international peace and security.

Website: http://www.un.org/en/sc/  
Combined document of topics/topic guide: Click here.