“The trespass of Indian border troops into China territory took place at

 defined Sikkim section of China-India boundary which is violation of 1890 Convention signed between China and Great Britain” Geng Shuang said during his regular press briefing here. He said the China-India boundary at Sikkim section had been defined by

 the 1890 Convention and the successive Indian governments had upheld it many times in written forms and also recognized that the two sides had no disagreement on the alignment of Sikkim section. It is unclear exactly what happened at the normally quiet stretch of land in the Himalayan mountains, but Indian media reported that 3,000 troops from India, the Sikkim sector claimed by China, and Bhutan, which also lays claim to the area, came to a "virtually eyeball-to-eyeball confrontation."
Amid a stand-off between China and India over the Doklam tri-junction, China tells India that former Indian prime minister Jawaharlal Nehru accepted the Convention of Calcutta which China is using to support its territorial claims. Tensions have been rising between China and India and Bhutan over Doklam since China began constructing a road in the disputed territory in mid-June.