What is a unique power held by the permanent members of the UN Security Council?

The unique power held by the permanent members of the UN Security Council is the ability to veto resolutions. This power allows any of the five permanent members—China, France, Russia, the United Kingdom, and the United States—to block the adoption of any substantive resolution, regardless of the level of international support. The veto power is a crucial aspect of the Council's functioning, as it ensures that the interests of these major powers are taken into account in decisions affecting international peace and security.

This power significantly influences the dynamics of international diplomacy and decision-making within the United Nations, as it can effectively halt initiatives even if there is widespread agreement among other member states. The existence of the veto power is rooted in the UN's founding principles, reflecting the geopolitical realities at the end of World War II when the organization was established.