A proposal by France and Mexico to limit the use of the veto power by the five permanent members of the United Nations Security Council has drawn considerable international interest. This initiative, now supported by the United Kingdom, aims to encourage these powerful nations to give up their veto in cases involving "mass atrocities." As of Monday, September 22, 128 countries back the proposal, with 21 new nations joining in the past four months. The proposal raises questions about reforming a system that is deeply rooted in the United Nations Charter. Article 27 of the Charter currently gives the five permanent Security Council members—China, the United States, Russia, France, and the United Kingdom—the power to block any resolution. To change this rule, a two-thirds majority in the General Assembly would be needed, followed by ratification by two-thirds of all member states, including the permanent Security Council members. This creates a major hurdle, as China, the U.S., and Russia have not supported the initiative so far. Chloé Maurel, a historian and UN specialist, explains that while a legally binding agreement to reduce the veto rights of permanent members would need their approval, this seems unlikely. However, the initiative could still gain traction as a voluntary political commitment, with growing pressure on the permanent members to reconsider their position. The United Kingdom's recent support for the initiative is particularly noteworthy, as it is a permanent Security Council member that has not used its veto since 1989. This move aligns with the UK's longstanding backing of the ACT code of conduct, which urges Security Council members to avoid using their veto in cases involving mass atrocities. The veto power is controversial because it can paralyze the Security Council and create an imbalance among nations. It can prevent the United Nations from responding to serious crimes, even when they occur, and is sometimes used for geopolitical reasons. The initiative focuses on situations involving genocide, crimes against humanity, and war crimes, relying on established categories in international law. However, disagreements over how to define these events remain a challenge. Despite these obstacles, the initiative could become a widely accepted political norm, even if it doesn't become a legally enforceable rule against the five permanent members. Its growing support may influence the behavior of these powerful nations over time, even without formal legal changes.