TREATY OF PUNAKHA

There was some prior working agreement between Bhutan and British India, signed in 1865.
It was the agreement signed on 1910 at Punakha Dzong.
Under the Treaty of Punakha, Britain guaranteed Bhutan’s independence and took control of Bhutanese foreign relations.
It also affirmed Bhutanese independence as one of the few Asian kingdoms, never conquered by a regional or colonial power.