Korean Peninsula conflict

Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

The unresolved military and political confrontation between North and South Korea, stemming from the 1945 partition and the 1950–53 Korean War, which ended in armistice but no peace treaty.
Are North and South Korea still technically at war?
Who signed the 1953 armistice?
What is the role of the UN Command today?

Updated June 22, 2026

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Timeline

25 June 1950
The active phase began with the Korean War (1950–1953), triggered when DPRK forces crossed the 38th parallel on .
27 July 1953
Hostilities ended with the Korean Armistice Agreement signed at Panmunjom on , establishing the Demilitarized Zone (DMZ) roughly along the front line.

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In 2017, the UN Security Council unanimously adopted Resolution 2371 imposing new sanctions on the DPRK after its July intercontinental ballistic missile tests.

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Research it like a delegate

The Korean Peninsula conflict refers to the unresolved military and political division between the Democratic People's Republic of Korea (DPRK/North Korea) and the Republic of Korea (ROK/South Korea), rooted in the post-1945 partition of the peninsula along the 38th parallel by the United States and the Soviet Union after Japan's surrender.

The active phase began with the Korean War (1950–1953), triggered when DPRK forces crossed the 38th parallel on 25 June 1950. The UN Security Council, with the Soviet delegate absent, authorized a multinational force under Resolution 84 (1950) led by the United States. The People's Republic of China intervened on the DPRK side in October 1950. Hostilities ended with the Korean Armistice Agreement signed at Panmunjom on 27 July 1953, establishing the Demilitarized Zone (DMZ) roughly along the front line. South Korea did not sign the armistice, and no formal peace treaty has ever been concluded, meaning the two states remain technically at war.

Key ongoing flashpoints include:

Nuclear and missile proliferation: The DPRK withdrew from the Nuclear Non-Proliferation Treaty in 2003 and has conducted six declared nuclear tests (2006, 2009, 2013, two in 2016, and 2017), prompting successive UN Security Council sanctions resolutions including 1718, 1874, 2270, and 2371.
Maritime incidents: Clashes along the disputed Northern Limit Line in the Yellow Sea, including the 2010 sinking of the ROKS Cheonan and shelling of Yeonpyeong Island.
Diplomatic episodes: The Six-Party Talks (2003–2009), inter-Korean summits in 2000, 2007, and 2018, and the Trump–Kim summits in Singapore (2018), Hanoi (2019), and the DMZ (2019).

The conflict implicates the United States (which maintains roughly 28,500 troops in the ROK under a 1953 Mutual Defense Treaty), China, Japan, and Russia. It remains a recurring agenda item in UNSC, IAEA, and DISEC forums.

Frequently asked questions

Are North and South Korea still technically at war?

Yes. The 1953 Korean Armistice Agreement halted fighting but was never replaced by a peace treaty, so the two states remain in a state of war under international law.

Who signed the 1953 armistice?

It was signed by representatives of the Korean People's Army, the Chinese People's Volunteer Army, and the UN Command. South Korea's government refused to sign.

What is the role of the UN Command today?

The UN Command, established under UNSC Resolution 84 in 1950 and led by the United States, continues to administer the armistice and the Demilitarized Zone.