The United Nations has told North Korea that there is an urgent need to keep channels open to avoid the risk of war. <br/><br/>The UN said this in a statement after the visit of its under-secretary-general for political affairs Jeffrey Feltman's to Pyongyang, the first highest-level trip by a UN official to the isolated nation in six years. <br/><br/>The statement said, during the visit, Mr Feltman had a series of meetings with North Korean Foreign Minister Yong Ho and his deputy PAK Myong Guk. <br/><br/>They exchanged views on the Korean Peninsula and agreed that the current situation was the most tense and dangerous peace and a security issue in the world. <br/><br/>The UN envoy emphasised the need for the implementation of all relevant Security Council resolutions. He said, there can only be a diplomatic solution to the situation, achieved through a process of sincere dialogue.<br/><br/>North Korea said, it has agreed to regular communication with the UN.<br/>Mr Feltman's visit came after the US and South Korea launched their biggest-ever annual joint air exercises. <br/><br/>The exercises were held a week after North Korea test-fired a powerful new intercontinental ballistic missile that experts say is capable of reaching the US.