Sino-Indian border dispute in the context of "Line of Actual Control"

The People's Republic of China (PRC) shares land borders with 14 countries (tied with Russia for the most in the world): North Korea, Russia, Mongolia, Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, Pakistan, India, Nepal, Bhutan, Myanmar, Laos, and Vietnam, and with two Special administrative regions of China, Hong Kong and Macao. The land borders, counterclockwise from northeast to southwest, are the China–North Korea border, the eastern segment of the China–Russia border, the China–Mongolia border, the western segment of the China–Russia border, the China–Kazakhstan border, the China–Kyrgyzstan border, the China–Tajikistan border, the China–Afghanistan border, the China–Pakistan border, the western segment of the China–India border (the most contested of the Sino-Indian border dispute), the China–Nepal border, the central segment of the China–India border (Sikkim), the China–Bhutan border, the eastern segment of the China–India border, the China–Myanmar border, the China–Laos border, the China–Vietnam border, a 3-kilometre (1.9 mi) internal border with Macau, a Portuguese territory until 1999, and a 30-kilometre (19 mi) internal border with the special administrative region of Hong Kong, which was a British dependency before 1997.

To the west, China has maritime borders with North Korea, Japan and contested limits with Taiwan and other countries in the South China Sea, among other territorial disputes.

The Sino-Soviet split was the gradual worsening of relations between China and the Union of Soviet Socialist Republics (USSR) during the Cold War. This was primarily caused by divergences that arose from their different interpretations and practical applications of Marxism–Leninism, as influenced by their respective geopolitics during the Cold War of 1947–1991. In the late 1950s and early 1960s, Sino-Soviet debates about the interpretation of orthodox Marxism became specific disputes about the Soviet Union's policies of national de-Stalinization and international peaceful coexistence with the Western Bloc, which Chinese leader Mao Zedong decried as revisionism. Against that ideological background, China took a belligerent stance towards the Western world, and publicly rejected the Soviet Union's policy of peaceful coexistence between the Western Bloc and Eastern Bloc. In addition, Beijing resented the Soviet Union's growing ties with India due to factors such as the Sino-Indian border dispute, while Moscow feared that Mao was unconcerned about the drastic consequences of nuclear warfare.

In 1956, Soviet leader Nikita Khrushchev denounced Joseph Stalin and Stalinism in the speech "On the Cult of Personality and Its Consequences" and began the de-Stalinization of the USSR. Mao and the Chinese leadership were appalled as the PRC and the USSR progressively diverged in their interpretations and applications of Leninist theory. By 1961, their intractable ideological differences provoked the PRC's formal denunciation of Soviet communism as the work of "revisionist traitors" in the USSR. The PRC also declared the Soviet Union social imperialist. For Eastern Bloc countries, the Sino-Soviet split was a question of who would lead the revolution for world communism, and to whom (China or the USSR) the vanguard parties of the world would turn for political advice, financial aid, and military assistance. In that vein, both countries competed for the leadership of world communism through the vanguard parties native to the countries in their spheres of influence. The conflict culminated after the Zhenbao Island Incident in 1969, when the Soviet Union reportedly considered the possibility of launching a large-scale nuclear strike against China, and the Chinese leadership, including Mao, was evacuated from Beijing, before both sides eventually returned to diplomatic negotiations.

Rutog County (Tibetan: རུ་ཐོག་རྫོང་།, Chinese: 日土县) is a county in Ngari Prefecture, Tibet Autonomous Region, China. The county seat is the new Rutog Town, located some 1,140 km (710 mi) or 700 miles west-northwest of the Tibetan capital, Lhasa. Rutog County shares a border with India, which is disputed.

The county has a rich history of folk tales, myths, legends, proverbs and folk songs and has many caves, rock paintings and other relics. The Xinjiang-Tibet Highway runs through the Rutog County for 340 km (210 mi). The modern county established in March 1961 covers 74,500 km (28,800 sq mi). It has a very low population density with a population of just over 10,000.

The Kashmir conflict is a territorial conflict over the Kashmir region, primarily between India and Pakistan, and also between China and India in the northeastern portion of the region. The conflict started after the partition of India in 1947 as both India and Pakistan claimed the entirety of the former princely state of Jammu and Kashmir. It is a dispute over the region that escalated into three wars between India and Pakistan and several other armed skirmishes. India controls approximately 55% of the land area of the region that includes Jammu, the Kashmir Valley, most of Ladakh, the Siachen Glacier, and 70% of its population; Pakistan controls approximately 30% of the land area that includes Azad Kashmir and Gilgit-Baltistan; and China controls the remaining 15% of the land area that includes the Aksai Chin region, the mostly uninhabited Trans-Karakoram Tract, and part of the Demchok sector.

After the partition of India and a rebellion in the western districts of the state, Pakistani tribal militias invaded Kashmir, leading the Hindu ruler of Jammu and Kashmir to join India. The resulting Indo-Pakistani War ended with a UN-mediated ceasefire along a line that was eventually named the Line of Control. In 1962, China invaded and fought a war with India along the disputed Indo-Chinese border, including in Indian administered-Ladakh, marking their entry to the Kashmir conflict. In 1965, Pakistan attempted to infiltrate Indian-administered Kashmir to precipitate an insurgency there, resulting in another war fought by the two countries over the region. After further fighting during the war of 1971, the Simla Agreement formally established the Line of Control between the territories under Indian and Pakistani control. In 1999, an armed conflict between the two countries broke out again in Kargil with no effect on the status quo.

The Galwan River flows from the disputed Aksai Chin area administered by China to the Union Territory of Ladakh, India. It originates near the caravan camping ground of Samzungling on the eastern side of the Karakoram range and flows west to join the Shyok River. The point of confluence is 102 km south of Daulat Beg Oldi. Shyok River itself is a tributary of the Indus River, making Galwan a part of the Indus River system.

The narrow valley of the Galwan River as it flows through the Karakoram mountains has been a flashpoint between China and India in their border dispute. In 1962, a forward post set up by India in the upper reaches of the Galwan Valley caused an "apogee of tension" between the two countries. China attacked and eliminated the post in the 1962 war, reaching its 1960 claim line. In 2020, China attempted to advance further in the Galwan Valley, leading to a bloody clash on 16 June 2020.

The Sino-Indian War, also known as the China–India War or the Indo-China War, was an armed conflict between China and India that took place from October to November 1962. It was a military escalation of the Sino-Indian border dispute. Fighting occurred along India's border with China, in India's North-East Frontier Agency east of Bhutan, and in Aksai Chin west of Nepal.

There had been a series of border skirmishes between the two countries after the 1959 Tibetan uprising, when India granted asylum to the Dalai Lama. Chinese military action grew increasingly aggressive after India rejected proposed Chinese diplomatic settlements throughout 1960–1962, with China resuming previously banned "forward patrols" in Ladakh after 30 April 1962. Amidst the Cuban Missile Crisis, seeing that the U.S. was pre-occupied with dealing with it, China abandoned all attempts towards a peaceful resolution on 20 October 1962, invading disputed territory along the 3,225-kilometre (2,004 mi) border in Ladakh and across the McMahon Line in the northeastern frontier. Chinese troops pushed Indian forces back in both theatres, capturing all of their claimed territory in the western theatre and the Tawang Tract in the eastern theatre. The conflict ended when China unilaterally declared a ceasefire on 20 November 1962, which can be attributed to the end of the Cuban Missile Crisis and fears of U.S. intervention to support India, and simultaneously announced its withdrawal to its pre-war position, the effective China–India border (also known as the Line of Actual Control).

The Demchok sector is a disputed area named after the villages of Demchok in Ladakh and Demchok in Tibet, situated near the confluence of the Charding Nullah and Indus River. It is a part of the greater Sino-Indian border dispute between China and India. Both China and India claim the disputed region, with a Line of Actual Control between the two nations situated along the Charding Nullah.

The Charding Nullah was mentioned by the name "Lhari stream" in a treaty between the Kingdom of Ladakh and the Ganden Phodrang government of Tibet in 1684 and stated as the boundary between the two regions. British surveys placed the border in 1847 between the princely state of Jammu and Kashmir and Qing Tibet on the stream, while British maps from 1868 onwards placed the border downstream and west of Demchok. After independence in 1947, India claimed the southern watershed of the river (roughly 3 miles southeast of Demchok) as its boundary, which has been contested by the People's Republic of China whose claims coincide with the British maps. The two countries fought a brief war in 1962, after which the Demchok region has remained divided between the two nations across a Line of Actual Control.