China has rejected India’s assertion that Arunachal Pradesh was its integral part. Rather Beijing said that  McMahon Line is “illegal” and the status of the border state was “never officially demarcated”.

Chinese foreign ministry spokesman Qin Gang said on Tuesday that New Delhi had not taken into account “historical facts”. “We deeply regret the Indian side’s remarks that take no regard of the historical facts,” Qin said.

“China and India have never officially settled demarcation of borders, and China’s stance on the eastern section of China-India borders is consistent and clear-cut,” Qin said at a regular bi-weekly news briefing.

“The current Chinese government, as well as previous ones, has never recognised the illegal ‘McMahon Line’, the official Xinhua news agency quoted Qin as saying.

“India knows this,” Qin said.

Earlier Indian External affairs Minister Pranab Mukherjee had asserted that Arunachal Pradesh is an integral part of India.

“The Chinese side is fully aware that Arunachal Pradesh is an integral part of India,” Mukherjee said during his visit to the hilly state before few days.

"People of Arunachal Pradesh regularly elect two representatives to the Lok Sabha and there is an elected state assembly carrying out the responsibility of administration like any of other 27 states. The question of parting company of Arunachal or any of its part does not arise," Mukherjee said on the occasion of the 8th Buddha Mahotsava at Tawang in Arunachal Pradesh.