Individuals who entered or lived in North Korea at any time since March 2011 will not be allowed into the United States under the Electronic System for Travel Authorization.<br />The U.S. Department of Homeland Security announced the new measures on Monday.<br />ESTA allows people from 38 countries including South Korea to visit the U.S. for up to 90 days without a visa.<br />But under the new measures, apart from a few exemptions for diplomatic and military purposes, anyone who has been to North Korea since 2011 will need to apply for an appropriate visa at the U.S. embassy.<br />The U.S. applies similar restrictions to people who have visited certain other countries including Iraq, Iran and Syria.<br />
