India and Bhutan: diplomatic ties, hydropower and trade

Background

Diplomatic relations between Bhutan and India were established in January 1968; the Golden Jubilee was celebrated in 2018.
Bhutan's foreign ministry calls cooperation in hydropower the centrepiece of the economic cooperation between the two countries.
India is Bhutan's largest development and most important trading partner, both as a source and a market.
As a landlocked country, all of Bhutan's third-country imports and exports transit through India.
India is the biggest market for several Bhutanese exports, including electricity, dolomite and ferrosilicon.
India's assistance has grown substantially since 1961, when Bhutan launched its first Five Year Plan.