North Korea vs South Korea

https://www.pri.org/stories/2015-08-20/brief-history-border-conflict-between-north-and-south-korea
http://www.history.com/topics/korean-war
https://en.wikipedia.org/wiki/Korean_War
https://en.wikipedia.org/wiki/North_Korea
http://www.csmonitor.com/World/Latest-News-Wires/2012/0104/North-Korea-military-has-an-edge-over-South-but-wouldn-t-win-a-war-study-finds
https://en.wikipedia.org/wiki/Korean_People%27s_Army
https://en.wikipedia.org/wiki/List_of_countries_by_number_of_military_and_paramilitary_personnel
https://en.wikipedia.org/wiki/Republic_of_Korea_Armed_Forces
https://www.theguardian.com/news/datablog/2011/dec/19/north-korea-facts-secretive-state
https://en.wikipedia.org/wiki/South_Korean_nuclear_research_programs
https://en.wikipedia.org/wiki/Nuclear_umbrella
http://www.icanw.org/the-facts/nuclear-arsenals/
http://www.globalfirepower.com/country-military-strength-detail.asp?country_id=north-korea
http://www.businessinsider.com/heres-who-would-win-in-a-war-between-north-and-south-korea-2016-4
http://www.csmonitor.com/World/Latest-News-Wires/2012/0104/North-Korea-military-has-an-edge-over-South-but-wouldn-t-win-a-war-study-finds
http://warisboring.com/north-korea-has-a-big-worn-out-air-force/
https://southfront.org/north-korea-vs-south-korea-comparison-of-military-capabilities-what-would-new-war-in-korea-look-like/