How does Vietnam war brought to UN?
The UN fought in Korea, they stayed out of Vietnam.
The UN wasn't really involved in the Vietnam war. It was more involved in the Korean war which happened a few years earlier. American's fear of commmunism seemed to be cemeted when North Korea attacked South Korea, America then asked the UN intervenean to stop the attack. Eventually they organised a military force to stop the attack.
Did the Korean War offer lessons for the Vietnam conflict which had they been needed might have changed the course of the war in Vietnam?
No. Neither was NATO nor the UN. Very few nations wanted to get involved with the Vietnam War. Other than some operations (military campaigns) the only war ever fought by the UN (discounting WWII...in which the term "UN" has been sometimes used) was the Korean War (1950-1953). NATO has been involved with numerous military "operations." But no major wars.
I am no expert, but I believe part of the problem was that the people at home became disillusioned and impatient with the Vietnam War and the media focused on that and may actually have helped to build the discontent and insistentence that our troops be brought home. History is repeating itself today with the war in Iraq.
It nearly ignited WWIII. It was the FIRST hostile confrontation between the communist and free world. It also influenced the future Vietnam War. North Korea was invaded by the US/UN. This resulted in Red China's entry into the war. Consequently, when the Vietnam War commenced years later, North Vietnam was NOT INVADED...as to keep either or both the USSR/Communist China from entering the war.
The Vietnam War divided Australia as a nation due to the introduction of conscription and the emotions and support those of the people expressed towards the war. Many people had different opinions on the Vietnam War, as it was highly televised, and not censored my the Government, unlike previous wars. They could see the terror it brought, and they believed the soldiers that were fighting were responsible. They were no longer considered heroes.