Indo-Nepal Treaty of Peace and Friendshipनेपाल–भारत शान्ति तथा मैत्री सन्धि, १९५०

Read cold, the main text is a friendship treaty with unusually generous people-to-people provisions: Articles 6 and 7 create near-national treatment for each other's citizens, the legal basis of the open border across which millions of Nepalis work in India and large numbers of Indians work in Nepal. Nepal, the smaller economy, has arguably extracted more daily benefit from these articles than India. But the treaty's security architecture — Article 2's consultation duty, Article 5 plus the secret letter's requirement of Indian 'assistance and agreement' for arms imports, and the letters' mutual-defence language — effectively placed Nepal under an Indian security umbrella, negotiated with an unelected regime that collapsed months later: the Rana government fell on 18 February 1951, under three and a half months after signing. For Nehru's India, the treaty answered the shock of China's move into Tibet in 1950 — Nehru declared Nepal within India's security perimeter, vowing 'we cannot allow that barrier to be crossed or weakened'.

That asymmetry of legitimacy is the heart of the grievance. Nepali critics note that the Rana signatory was a hereditary premier facing revolution, while India was represented merely by its ambassador — a protocol slight remembered to this day. The secrecy of the letters, acknowledged by Nehru only at a December 1959 press conference, compounded the sense of an imposed arrangement. India, for its part, points out that the treaty never stopped Nepal befriending China — Kathmandu concluded its boundary treaty with Beijing in 1961, bought Chinese arms in 1988, and joined the BRI in 2017 — and that either party could exit with one year's notice under Article 10.

The revision saga is a six-decade stalemate of rhetoric. PM Kirti Nidhi Bista first publicly called for revision in 1969, citing India's failure to consult Nepal during the 1962 China war and 1965 Pakistan war; the secret arms clause triggered the 1988–89 crisis when Nepal bought Chinese weapons; a communist government raised an official revision demand in 1994–95; abolition of the treaty was point one of the Maoists' 40-point demand of 4 February 1996 preceding the civil war; Foreign Minister Kamal Thapa carried a revision 'non-paper' to Delhi in September 1997; and PM Pushpa Kamal Dahal 'Prachanda' called for scrapping it in 2008. A reportedly secret 1965 Nepal–India arms agreement is also cited in the Nepali literature as part of this security web. Yet every government, once in office, finds the open border too valuable to touch.

The Eminent Persons Group is the perfect emblem of the stalemate: an eight-member joint expert group formed in 2016 to recommend updating all bilateral arrangements including the 1950 treaty completed its agreed report in 2018 — and the report has never been received by either government, with India declining to take delivery. Until that changes, the 1950 text — ten articles and a once-secret letter — remains the constitution of the world's most open international border.