Korean War thumb|upright|Moon and Kim shaking hands over the demarcation line on 27 April 2018 The Korean War broke out when Soviet-backed North Korea invaded South Korea, though neither side gained much territory as a result. The Korean Peninsula remained divided, the Korean Demilitarized Zone being the de facto border between the two states.
kOrean WAr THuMB|UprigHt|moON anD KIm shakIng hAnds ovER tHE demarCATion LINE ON 27 APriL 2018 ThE KOrean war brOke out wHen SovIet-baCKEd noRth korea invaDeD south koreA, tHougH NEiTHEr sIDe gAined mucH territorY aS a REsULt. tHe korEaN pEnInsUlA rEmaIneD dIvIDed, The koreAN deMIlitArized zone being the de facto bOrDeR beTWeEN tHe TWo states.