"From North Korea's perspective, a country that has declared the completion of its nuclear weapons power, the dialogue was a great opportunity for their position to be presented to the worldwide community", said Kim Yong-hyun, a professor of North Korean studies at Dongguk University in Seoul.
Both the UN delegation and the North Korean representatives acknowledged that Feltman's visit contributed to deepening the understanding between North Korea and the UN Secretariat, and both sides agreed to maintain communications through visits at different levels on a regular basis in the future, North Korea's state-owned news agency added.
Feltman arrived in North Korea on Tuesday and it is the first trip by a United Nations official to the isolated country in over seven years.
Speculation is rising in South Korea that the Kim Jong Un regime may have asked a senior United Nations official to ease sanctions against the country, as Jeffrey Feltman concluded his four-day visit to Pyongyang.
Feltman was a leading official in the U.S. State Department from 2009-12, before moving to the UN. Such ties with North Korea include military training, and the import and export of weapons.
On Wednesday, he met with North Korean Vice Foreign Minister Pak Myong-guk and Russian Ambassador to Pyongyang Alexander Matsegora.
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Feltman was expected to leave Pyongyang on a North Korean Air Koryo passenger jet to land in Beijing on Saturday.
"He's not traveling - I want to make this clear - with any kind of message from the USA government", she told reporters on Tuesday during a press briefing.
"Through the drill, the South Korean and US air forces displayed the allies' strong intent and ability to punish North Korea when threatened by nuclear weapons and missiles", the South Korean military said in a statement.
He made the rare visit at the invitation of Pyongyang amid heightened tensions sparked by the North's November 29 test of a new intercontinental ballistic missile that it claims is capable of striking anywhere on the US mainland.
In comments attributed to an unnamed Foreign Ministry spokesman, North Korea also claimed high-ranked USA officials, including CIA Director Mike Pompeo, have further confirmed American intent for war with a series of "bellicose remarks".