"The diplomatic channels for the communication between Chinese and Indian sides remained unimpeded," Chinese Foreign Ministry spokesman Lu Kang told media briefing here.
He said the Indian troops "trespassed" the recognised delineated boundary between China and India on June 18. This is the first time China came out the with precise date about Indian troops entering the disputed Doklam area (referred by China as Donglong) near Sikkim allegedly to stop Chinese troops from constructing a road.
He said in additions to the photographs of alleged Indian "incursion" into Donglong area, the Chinese foreign ministry will also upload a map on its website to provide a "better understanding of the reality".
He also refuted Bhutan's allegation that Chinese troops' attempts to build the road violated the 1988 and 1999 agreements to maintain peace and tranquilly.
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Lu said China has "indisputable sovereignty over the Donklam area."
Lu said the area where Chinese side undertook road construction "totally belongs to the Chinese territory" and offered to release details on this on foreign ministry's website.
"From historical evidence we can see that Doklam has been a traditional pasture for the Tibetan residents and we have exercised good administration over the area," he said.
Before the 1960s, if the Bhutan residents around the border wanted to graze their cattle they had to get the approval from China, he said.
"In addition to the jurisprudential evidence, the historical convention in 1890 (the Sinio-British treaty) has clearly defined it as the crossing point between China, Bhutan and Indian boundary.
"The Doklam area belongs to Chinese territory and we are exercising complete and comprehensive administration over the the region and our border troops and the residents around the border are herding their cattle along this," he said.
He claimed that the evidence is recognised by the Bhutan side.
"Even though China and Bhutan have not established diplomatic relationship we always maintain traditional friendship. We can tell you that Chinese people are friendly and want good relations with Bhutan people," he said.
A standoff erupted between the two militaries after the Indian Army blocked construction of the road by China in Doklam, a disputed territory between China and Bhutan also known as Donglong.
Of the 3,488-km-long India-China border from Jammu and Kashmir to Arunachal Pradesh, a 220-km section falls in Sikkim.