On May 8, India‘s Defence Minister virtually inaugurated a new 80 km-long road in the Himalayas, connecting to the border with China, at the Lipulekh pass. The Nepali government protested immediately, contending that the road crosses territory that it claims and accusing India of changing the status quo without diplomatic consultations. Among the many escalatory moves since then, Nepal deployed police forces to the region, summoned the Indian ambassador in Kathmandu, and initiated a constitutional amendment to formalise and extend its territorial claims over approximately 400 sq km. India, on the other hand, has conveyed its openness to a dialogue but does not seem to share Nepal‘s sense of urgency: its initial statement agreed to a dialogue, but only after the COVID-19 crisis. India has been in effective possession of this territory for at least sixty years, although Nepal claims it conducted a census there in the early 1950s and refers to the 1815 Sugauli Treaty as legitimising its claims. But India‘s new road, up to the Lipulekh pass, is not an unprecedented change in the status quo. India has controlled this territory and built other infrastructure here before, besides conducting its administration and deploying military forces up to the border pass with China. The region is of strategic importance, and the new road is now one of the quickest links between Delhi and the Tibetan plateau. In a 2015 statement, China also recognised India‘s sovereignty by agreeing to expand trade through the Lipulekh pass.

Source: Excerpt from the brookings.edu, written by Dr. Constantino Xavier. (Dated- 11th June, 2020)

The treaty of Sugauli was signed between which of the following pairs?