Equatorial Guinea, Ivory Coast, Kuwait, Peru, Poland and the Netherlands formally joined the ranks of the non-permanent members of the United Nations Security Council on Tuesday. <br/><br/>The UN Security Council has 15 members, including five with permanent seats who have the power to veto resolutions — Britain, China, France, Russia and the United States.<br/><br/>The six countries who left the UN Security Council on December 31 are Egypt, Italy, Japan, Senegal, Ukraine and Uruguay.