The Sino-Burmese boundary treaty delineating their mutual border was signed on 1 October 1960, and was ratified a year afterwards. While most of the Sino-Myanmar border remains unchanged to this day, the exact location of the China-Myanmar-India trijunction remains in dispute. The modern history of the boundary begins with the British conquest of Upper Burma in late 1885 and that kingdoms proclamation as British territory on 1 January 1886. The Sino-Burmese boundary was to be marked by a Delimitation Commission, and the conditions of frontier trade to be settled by a Frontier Trade Convention, both countries agreeing to protect and encourage trade between China and Burmah. In 1895, a year after the initial boundary convention, China, under pressure from France, ceded part of Keng-Hung to the latter, as part of the delimitation of the Sino-Indochina boundary. China's restraint in the matter was due to its own internal exhaustion, and the danger of overt aggression pushing Burma into the western camp.