Bhutan's early history is steeped in mythology and remains obscure. Some of the structures provide evidence that the region has been settled as early as 2000 BC. According to a legend it was ruled by a Cooch-Behar king, Sangaldip, around the 7th century BC, but not much is known prior to the introduction of Tibetan Buddhism in the 8th century, when turmoil in Tibet forced many monks to flee to Bhutan. In the 12th century, the Drukpa Kagyupa school was established and remains the dominant form of Buddhism in Bhutan today. The country's political history is intimately tied to its religious history and relations among the various monastic schools and monasteries.
Bhutan has diplomatic relations with 56 of 193 member states of the United Nations and the European Union. Bhutan's limited number of such relations, including the absence of formal relations with any of the permanent members of the United Nations Security Council, is part of a deliberate isolationist policy of limiting foreign influence in the state. This stance has been safeguarded by close relations with India, of which Bhutan has previously been considered a protected state.
Sikkim is a state in northeastern India. It borders the Tibet Autonomous Region of China in the north and northeast, Bhutan in the east, Koshi Province of Nepal in the west, and West Bengal in the south. Sikkim is also close to the Siliguri Corridor, which borders Bangladesh. Sikkim is the least populous and second-smallest among the Indian states. Situated in the Eastern Himalaya, Sikkim is notable for its biodiversity, including alpine and subtropical climates, as well as being a host to Kangchenjunga, the highest peak in India and third-highest on Earth. Sikkim's capital and largest city is Gangtok. Almost 35% of the state is covered by Khangchendzonga National Park – a UNESCO World Heritage Site.
Jelep La elevation 14,390 feet (4,390 m), is a high mountain pass between Sikkim, India and Tibet Autonomous Region, China. It is on a route that connects Lhasa to India. The pass is about 4 km (2.5 mi) south of Nathu La and is slightly higher. It was frequently used for trade between Tibet and India during the British Raj, with Kalimpong serving as the contact point. The Menmecho Lake lies below the Jelep La.
The history of Sikkim begins with the indigenous Lepcha's contact with early Tibetan settlers. Historically, Sikkim was a sovereign Monarchical State in the eastern Himalayas. Later a protectorate of India followed by a merger with India and official recognition as a state of India. Lepchas were the main inhabitants as well as the Rulers of the land up to 1641. Lepchas are generally considered to be the first people, Indigenous to Sikkim also includes Darjeeling.
Bhutan, officially the Kingdom of Bhutan, is a landlocked country in South Asia situated in the Eastern Himalayas between China in the north and India in the south, with the Indian state of Sikkim separating it from neighbouring Nepal. With a population of over 727,145 and a territory of 38,394 square kilometres (14,824 sq mi), Bhutan ranks 133rd in land area and 160th in population. Bhutan is a constitutional monarchy with a Druk Gyalpo (king) as the head of state and a prime minister as the head of government. The Je Khenpo is the head of the state religion, Vajrayana Buddhism.
The Chumbi Valley, called Dromo or Tromo in Tibetan, is a valley in the Himalayas that projects southwards from the Tibetan plateau, intervening between Sikkim and Bhutan. It is coextensive with the administrative unit Yadong County in the Tibet Autonomous Region of China. The Chumbi Valley is connected to Sikkim to the southwest via the mountain passes of Nathu La and Jelep La.
Bhutanese refugees are Lhotshampas ("southerners"), a group of Nepali language-speaking Bhutanese people. These refugees registered in refugee camps in eastern Nepal during the 1990s as Bhutanese citizens who fled or were deported from Bhutan during the protest against the Bhutanese government by some of the Lhotshampas demanding human rights and democracy in Bhutan. As Nepal and Bhutan have yet to implement an agreement on repatriation, most Bhutanese refugees have since resettled in North America, Oceania and Europe under the auspices of the Office of the United Nations High Commissioner for Refugees. Many Lhotshampa have also migrated to areas of West Bengal and Assam in India independently of the UNHCR.
Immigration to Bhutan has an extensive history and has become one of the country's most contentious social, political, and legal issues. Since the twentieth century, Bhutanese immigration and citizenship laws have been promulgated as acts of the royal government, often by decree of the Druk Gyalpo on advice of the rest of government. Immigration policy and procedure are implemented by the Lhengye Zhungtshog Ministry of Home and Cultural Affairs, Department of Immigration. Bhutan's first modern laws regarding immigration and citizenship were the Bhutanese Citizenship Act 1958 and subsequent amendments in 1977. The 1958 Act was superseded by the Bhutanese Citizenship Act 1985, which was then supplemented by a further Immigration Act in 2007. The Constitution of 2008 included some changes in Bhutan's immigration laws, policy, and procedure, however prior law not inconsistent with the 2008 Constitution remained intact. Bhutan's modern citizenship laws and policies reinforce the institution of the Bhutanese monarchy, require familiarity and adherence to Ngalop social norms, and reflect the social impact of the most recent immigrant groups.
The Kingdom of Sikkim officially Dremoshong until the 1800s, was a hereditary monarchy in the Eastern Himalayas which existed from 1642 to 16 May 1975, when it was annexed by India. It was ruled by Chogyals of the Namgyal dynasty.
The bilateral relations between the Himalayan Kingdom of Bhutan and the Republic of India have been traditionally close and both countries share a "special relationship", making Bhutan a protected state, but not a protectorate, of India. India remains influential over Bhutan's foreign policy, defence and commerce. Bhutan is the largest beneficiary of India's foreign aid.
Bhutan-China relations refer to the international relationship between the Kingdom of Bhutan and the People's Republic of China. As of present, Bhutan and China do not share an official diplomatic relationship with one another.
Slavery in Bhutan was a common legal, economic, and social institution until its abolition in 1958. In historical records, unfree labourers in Bhutan were referred to as slaves, coolies, and serfs. These labourers originated mostly in and around Bhutan, Assam, and Sikkim, and were the backbone of Bhutan's pre-money feudal economy.
The Sikkim expedition was an 1888 British military expedition to expel Tibetan forces from Sikkim. The roots of the conflict lay in British–Tibetan competition for suzerainty over Sikkim.
The Bhutan–China border is the international boundary between Bhutan and China, running for 477 km (296 mi) through the Himalayas between the two tripoints with India. The official boundaries remain disputed.
Gipmochi is a mountain in the Lower Himalayas in south central Asia. Rising to a height of 14,523 feet (4,427 m), the mountain sits on the border between the northern Indian state of Sikkim and Bhutan. China claims Gipmochi as the China–India–Bhutan tri-junction point. Bhutan and India, however, claim that the tri-junction is 6.5 km to the north, at Batang La.
Doklam, called Donglang by China, is an area in Chumbi Valley with a high plateau and a valley, lying between China's Yadong County to the north, Bhutan's Ha District to the east and India's Sikkim state to the west. Since the 1960s, China and Bhutan have disputed sovereignty over the Doklam area. The dispute has not been resolved despite several rounds of border negotiations between Bhutan and China. The area is of strategic importance to all three countries.
Eastern South Asia is a subregion of South Asia. It includes the countries of Bangladesh, Bhutan, India, and Nepal. Geographically, it lies between the Eastern Himalayas and the Bay of Bengal. Two of the world's largest rivers, the Ganges and the Brahmaputra, flow into the sea through Eastern South Asia. The region includes the world's highest mountainous terrain and the world's largest delta, and has a climate ranging from alpine and subalpine to subtropical and tropical. Since Nepal, Bhutan, and northeast India are landlocked, the coastlines of Bangladesh and East India serve as the principal gateways to the region.
The 2017 China–India border standoff or Doklam standoff was a military border standoff between the Indian Armed Forces and the People's Liberation Army of China over Chinese construction of a road in Doklam, near a trijunction border area known in Chinese as Donglang, or Donglang Caochang . On 16 June 2017 Chinese troops with construction vehicles and road-building equipment began extending an existing road southward in Doklam, a territory that is claimed by both China and India's ally Bhutan.
The Five Fingers of Tibet was a Chinese territorial claim to the Himalayan region bordering India attributed to Mao Zedong. It considers Tibet to be China's right hand palm, with five fingers on its periphery: Ladakh, Nepal, Sikkim, Bhutan, and North-East Frontier Agency that are considered China's responsibility to "liberate". The policy however has never been discussed in official Chinese public statements and is now dormant, but concerns have often been raised over its possible continued existence or revival.
Bhutan 
Nepal 
Sikkim