The USA is trying to escalate the Korean peninsula tension.

https://sg.news.yahoo.com/russia-north-korea-summit-undermines-u-n-aggravates-165723310.html

The USA is trying to supersede the UN by getting 20 countries to participate in a non-UN sanction against North Korea.  This is an illegal sanction and doesn't have the UN mandate.  The 20 countries involved are the same countries that attacked NK in the past.  Therefore, we can tell from this that the USA still possesses the cold war mentality.

Furthermore, the USA is begging for a war with North Korea when the Korean peninsula tension is easing between SK & NK.  This is evident from the way the US is conducting a military exercise against NK on its homeland.

https://www.nytimes.com/2018/01/14/us/politics/military-exercises-north-korea-pentagon.html