Operation Laos was a brief war that started between Laos and Thailand. By the end of the war Manchuria, China, Burma, and Pakistan all had over ten thousand troops in Laos. Over 125,000 people died on both sides.
After Thailand's takeover of Cambodia, Laos became worried, strengthening their borders with Thailand. Border skirmishes came to a head in August of 1972 when Laos declared war on Thailand. Immediately Manchuria and Burma, Thailand's closest allies joined the war and after promising battles China joined in against Laos, wanting to take a piece of the nation when it fell. On December 17, Laos pleaded internationally for any help, and after Burma had taken pieces of Pakistan, Pakistan declared war on China, Thailand, and Burma, leaving out Manchuria, stating in a press conference that "Pakistan has no fight with Manchuria." Soon after Indonesia send 2000 troops to Thai ports, attacking up and down Thailand's coastline.
On January 5, 1973 the battle reached a brief stalemate outside of Vientiane. But within a month the city fell to Thai troops. Soon after Indonesia sent 6000 more troops to Laos. Brunei and Nepal entered the fight, soon after, backing Laos. On June 3, Manchuria forced its puppet states, North Korea, and Hǎi guó to enter the fight, supporting Thailand.