This issue doesn't depend only of the UN. It's a global affair.
Countries that were members of the UN (United Nations) sent troops to the war.
Member countries of the UN supplied troops and war materials to aid South Korea.
The UN fought North Korea, Red China. The US was part of the UN.
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The UN determined that Iraq had never had WMD
Do you mean which countries are not part of the UN?
Both, because the US was part of the UN. The troops from the UN came from countries other than the US, but the US had the most troops.
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There are currently 192 countries involved in the UN.
There are 193 member States.
UK and USA
Currently, there are 192 participating countries in the UN.