The Korean Front involved the 2015 full-scale ground invasion of South Korea by Russian-backed North Korean military forces during World War III.
Invasion of South Korea
Upon the outbreak of war between Russia and NATO, North Korea entered into a de facto alliance with the Russian Federation against a common foe and began a full mobilization of the Korean People's Army (KPA). Two days after the Russian military invaded the Baltic States and Poland, North Korea launched a full-scale attack on South Korea. Heavy artillery and ground-to-ground missiles rained down on ROK fortifications along the southern side of the DMZ. The Korean People's Army Special Operation Force (NKSOF) attacked key military and civilian targets throughout South Korea. A number of ROK government officials and military general officers were assassinated.
The Joint Security Area within the Demilitarized Zone was rapidly transformed into a battleground as the ROK garrison was attacked by KPA and NKSOF forces. The fight was over in ten minutes with a decisive North Korean victory. All surviving ROK, USFK, and UNC personnel in the now former "Truce Village" were summarily executed.
Less then an hour after the initial attacks had begun, North Korean armored units crossed the DMZ into South Korea. ROK defenses were overrun in less then 24 hours and KPA forces began their push south towards Seoul. The Eighth United States Army was moving as quickly as possible to fortify Seoul as well as stage hit-and-run attacks to delay the KPA advance towards the capital.
Battle of Seoul
On July 25, Seoul was rapidly transformed into a major urban battlefield as North Korean troops poured into the city and US/ROK forces fought back. The Battle of Seoul continued into August. Despite the numerical superiority of the KPA, the technological might of the US/ROK combined forces was enough to prevent the fall of the South Korean capital. By mid-month, the North Koreans were pushed from the city.
As US/ROK forces advanced north towards the DMZ, North Korean dictator Kim Jong-un was becoming increasingly desperate. He ordered all remaining artillery and missile batteries to commence full-scale bombardment of Seoul. Within hours, the death toll exceeded ten thousand and many important structures in the capital were destroyed.
The conflict worsened on August 22 when the North Korean Strategic Rocket Forces launched several ballistic missiles believed to be armed with nuclear warheads. Most of the missiles were intercepted by America's THAAD anti-ballistic missile system. Unfortunately one nuclear-armed missile made it through and detonated over advancing US/ROK troops with an estimated yield of 10 kilotons. Thousands of American and South Korean soldiers were killed instantly and over ten thousand more wounded.
Outrage to North Korea's nuclear attack on Allied troops is immediate and enormous. Many in the United States and South Korea call for the complete and total annihilation of North Korea. President Obama had considered a nuclear retaliatory response against Kim Jong-un's regime, but was concerned that doing so would almost certainly result in further escalation of the ongoing conflict with Russia. Instead the President ordered B-2 stealth bombers to begin a conventional carpet bombing campaign of Pyongyang.
On August 25, just three days after the nuclear attack on US/ROK forces, the Kim Dynasty came to an abrupt end as a result of a coup sponsored by the People's Republic of China. Simultaneously, the newly reorganized People's Volunteer Army crossed the Yalu River into North Korea and advanced south towards Pyongyang. North Korea's new leader ordered the immediate withdrawal of all remaining KPA forces south of the 38th Parallel and not to interfere with Chinese forces operating within the country.
A new armistice was negotiated between North and South Korea by the end of the month with status quo ante bellum maintained. In a gesture of good faith, the new North Korean government extradited Kim Jong-un to South Korea to be tried as a war criminal. The Chinese People's Volunteer Army relieved the Korean People's Army of most duties including patrolling the Demilitarized Zone. Chinese President Xi Jinging made clear to both the Americans and Russians that they desired no further part in the ongoing global conflict and warned both sides against any encroachment into sovereign Chinese territory.