face of ethnic cleansing. In 1994, the United Nations Assistance Mission for Rwanda failed to intervene in the Rwandan genocide in the face of Security Council indecision. In the late 1990s, UN-authorized international interventions took a wider variety of forms. The UN mission in the 1991–2002 Sierra Leone Civil War was supplemented by British Royal Marines and the UN-authorized 2001 invasion of Afghanistan was overseen by NATO. In 2003, the US invaded Iraq despite failing to pass a UN Security Council resolution for authorization, prompting a new round of questioning of the organization's effectiveness. In the same decade, the Security Council intervened with peacekeepers in crises including the War in Darfur in Sudan and the Kivu conflict in the Democratic Republic of Congo. In 2013, an internal review of UN actions in the final battles of the Sri Lankan Civil War in 2009 concluded that the organization had suffered "systemic failure". In November/December 2014, Egypt presented a motion proposing an expansion of the NPT (non-Proliferation Treaty), to include Israel and Iran; this proposal was due to increasing hostilities and destruction in the Middle-East connected to the Syrian Conflict as well as others. All members of the Security Council are signatory to the NPT, and all permanent members are nuclear weapons states. Role The UN's role in international collective security is defined by the UN Charter, which authorizes the Security Council to investigate any situation threatening international peace; recommend procedures for peaceful resolution of a dispute; call upon other member nations to completely or partially interrupt economic relations as well as sea, air, postal and radio communications, or to sever diplomatic relations; and enforce its decisions militarily, or by any means necessary. The Security Council also recommends the new Secretary-General to the General Assembly and recommends new states for admission as member states of the United Nations. The Security Council has traditionally interpreted its mandate as covering only military security, though US Ambassador Richard Holbrooke controversially persuaded the body to pass a resolution on HIV/AIDS in Africa in 2000. Under Chapter VI of the Charter, "Pacific Settlement of Disputes", the Security Council "may investigate any dispute, or any situation which might lead to international friction or give rise to a dispute". The Council may "recommend appropriate procedures or methods of adjustment" if it determines that the situation might endanger international peace and security. These recommendations are generally considered to not be