Historically, Sikkim was a British dependency, with a status similar to that of the other princely states, and was therefore considered to be within the frontiers of India in the colonial period. On independence, however, the Chogyal of Sikkim resisted full integration into India. Given the region's strategic importance to India, the Government of India signed first a Standstill Agreement and then in 1950 a full treaty with the Chogyal of Sikkim which in effect made it a protectorate which was no longer part of India. India had responsibility for defence, external affairs and communications, and ultimate responsibility for law and order, but Sikkim was otherwise given full internal autonomy. In the late 1960s and early 1970s, the Chogyal Palden Thondup Namgyal, supported by the minority Bhutia and Lepcha upper classes, attempted to negotiate greater powers, particularly over external affairs, to give Sikkim more of an international personality. These policies were opposed by Kazi Lhendup Dorji and the Sikkim State Congress, who represented the ethnic Nepali middle classes and took a more pro-Indian view.