The United Nations Security Council will hold an emergency meeting today to discuss an international response to North Korea's latest nuclear test. <br/><br/>The US mission today said in a statement that the United States, Britain, France, Japan and South Korea requested the urgent meeting, to be held at 10 am (1400 GMT). The council will meet in an open session, in contrast to many other meetings on North Korea that have been held behind closed doors.<br/><br/>The latest underground blast was North Korea's sixth nuclear test, in defiance of UN resolutions that prohibit Pyongyang from pursuing nuclear and missile programs.<br/>'<br/><br/>