Veripedia

Korean War

The Korean War was an international armed conflict on the Korean Peninsula from 1950 to 1953. It began when North Korean forces crossed into South Korea and brought in a United Nations-led command supporting the South, followed by Chinese intervention on North Korea’s side. The fighting stopped under the 1953 Korean Armistice Agreement, which established a demilitarized zone but was not a peace treaty; Korea remains divided.

Last updated
21 October 2026
Confidence
High (98%)
Sources
6
Versions
2
This article was researched and drafted with AI assistance and checked by an automated review pass. It is not guaranteed to be accurate — verify important facts against the references below.

Division and outbreak

After Japan's defeat in the Second World War, Korea was divided into northern and southern occupation zones around the 38th parallel. Rival governments were established in 1948: the Democratic People's Republic of Korea in the north and the Republic of Korea in the south. On 25 June 1950, North Korean forces crossed the parallel and invaded the South, turning the peninsula's unresolved division and earlier border tensions into a full-scale war. The United Nations Security Council called for the attack to stop and for North Korean forces to withdraw; it later recommended that UN members assist South Korea. A United Nations Command, led by the United States, coordinated forces from member states that supported the South.

A changing international conflict

North Korean forces advanced rapidly south, and South Korean and United Nations Command troops were pushed into a defensive position around Busan. A United Nations Command landing at Incheon in September 1950 helped reverse that advance; its forces recaptured Seoul and moved north. In November, Chinese People's Volunteer forces entered the conflict across the Yalu River and drove United Nations Command forces back south. The front shifted repeatedly before settling near the 38th parallel in 1951. Thereafter, major fighting continued around the line while negotiations proceeded. The conflict involved Korean forces on both sides as well as international military support, making it a major early Cold War confrontation.

Armistice, not a peace treaty

Negotiations began in July 1951 and continued as fighting went on. On 27 July 1953, representatives of the United Nations Command and the Korean People's Army and Chinese People's Volunteers signed the Korean Armistice Agreement at Panmunjom. It ordered a cessation of hostilities and set a Military Demarcation Line, with opposing forces withdrawing to create a Demilitarized Zone. The agreement was a military armistice rather than a political peace treaty. It stopped large-scale fighting but did not reunify Korea or resolve the peninsula's political division.

Consequences and historical significance

The war caused extensive loss of life and displacement among soldiers and civilians, and left the peninsula divided. The armistice's cease-fire arrangements, demarcation line and buffer zone became central to the postwar order between North and South Korea. The conflict also demonstrated how a local war could become international during the Cold War: decisions by the United Nations, the United States and China shaped its course, while the front line ended close to the division from which the war had begun.

Key facts

Dates
25 June 1950–27 July 1953.
Opposing Korean states
The Democratic People's Republic of Korea (North Korea) and the Republic of Korea (South Korea).
International forces
A United Nations-led command supported South Korea; Chinese People's Volunteer forces entered the war on North Korea's side.
Armistice
Signed at Panmunjom on 27 July 1953; it ended large-scale fighting but was not a peace treaty.
Demilitarized Zone
The 1953 agreement established a buffer zone around the Military Demarcation Line.
Outcome
Korea remained divided after the armistice.

Timeline

  1. 1945

    After Japan's defeat in the Second World War, Korea was divided into northern and southern occupation zones around the 38th parallel.

  2. 1948

    The Democratic People's Republic of Korea and the Republic of Korea were established in the north and south, respectively.

  3. 25 June 1950

    North Korean forces crossed the 38th parallel into South Korea; the UN Security Council adopted Resolution 82 calling for hostilities to cease and for withdrawal.

  4. 27 June 1950

    Security Council Resolution 83 recommended UN-member assistance to South Korea.

  5. 15 September 1950

    United Nations Command forces landed at Incheon, beginning an operation that helped turn the military situation in the South.

  6. 25 November 1950

    Chinese People's Volunteer forces crossed the Yalu River into North Korea and pushed United Nations Command forces south.

  7. 10 July 1951

    Armistice negotiations began at Kaesong and later continued at Panmunjom.

  8. 27 July 1953

    The Korean Armistice Agreement was signed at Panmunjom, stopping the fighting without concluding a peace treaty.

Ask about this article

Answers use only “Korean War” and its references, with citations.

References

  1. 1.
    Agreement between the Commander-in-Chief, United Nations Command, on the one hand, and the Supreme Commander of the Korean People's Army and the Commander of the Chinese People's Volunteers, on the other hand, concerning a military armistice in Korea

    United Nations Peacemaker · other · reliability: high · retrieved 21 October 2026

    Supports: Primary text of the 1953 Korean Armistice Agreement, including the cessation of hostilities and creation of a Military Demarcation Line and Demilitarized Zone.

  2. 2.
    Korean War

    Encyclopaedia Britannica · other · reliability: high · retrieved 21 October 2026

    Supports: Background to Korea's division, the 1950 invasion, the participation of North Korea, South Korea, China, the United States and the United Nations, major phases and the armistice.

  3. 3.
    History of the Korean War

    United Nations Command · other · reliability: high · retrieved 21 October 2026

    Supports: The UN Security Council resolutions, formation and role of United Nations Command, military chronology, start of armistice talks and the 27 July 1953 agreement.

  4. 4.
    Korean War Campaigns

    U.S. Army Center of Military History · other · reliability: high · retrieved 21 October 2026

    Supports: Campaign chronology from the June 1950 crossing of the 38th parallel through later campaigns and signature of the armistice.

  5. 5.
    Armistice Agreement for the Restoration of the South Korean State (1953)

    U.S. National Archives and Records Administration · other · reliability: high · retrieved 21 October 2026

    Supports: The postwar division, conflict's effects, signing of the armistice, its main provisions and the distinction between a truce and a permanent peace treaty.

  6. 6.
    Resolution 82 (1950) / [adopted by the Security Council at its 473rd meeting], of 25 June 1950

    United Nations Digital Library; United Nations Security Council · other · reliability: high · retrieved 21 October 2026

    Supports: Original record of Security Council Resolution 82, adopted on 25 June 1950, calling on North Korean authorities to withdraw their forces to the 38th parallel.

References are suggested by the research engine and may be incomplete. Unverified URLs are omitted rather than guessed.

Article history

  1. Version 221 October 2026 · EditorUpdated by Zapia
  2. Version 121 October 2026 · EditorCreated by Zapia