Sources in Delhi said today that the Indian security forces in Nathu La immediately informed the Chinese army over the hotline about the UAV's technical problem and crossing the Line of Actual Control(LAC).
The Indian defence ministry said its border security personnel, as per standard protocol, immediately alerted their Chinese counterparts to locate the UAV and they later reverted with its location. It, however, did not give details of when the UAV had crashed but sources in Delhi said the incident happened around 10 days ago.
In Beijing, China's Defence Ministry and the Ministry of Foreign Affairs said that the Indian unmanned aerial vehicle (UAV) crashed into the Chinese side of the border recently.
"Recently an Indian Unmanned Aerial Vehicle (UAV) invaded China's airspace and crashed in the Sikkim section of China- India border," Foreign Ministry spokesman Geng Shuang told a media briefing here.
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He said the Chinese border troops had taken a "professional and responsible attitude" to verify the device.
The Indian defence ministry said the exact cause of the incident is under investigation.
"An Indian UAV which was on a regular training mission inside the Indian territory lost contact with the ground control due to some technical problem and crossed over (to) the LAC in the Sikkim Sector," it said in a statement released in Delhi.
It further said, "As per standard protocol, the Indian border security personnel immediately alerted their Chinese counterparts to locate the UAV. In response, the Chinese side reverted with the location details of the UAV."
Beijing often referred to the 1890 Britain-China treaty during the lengthy Dokalam standoff, stating that it has defined the Sikkim section of the boundary with Tibet, therefore the border in that area has been settled.
"The action of the Indian side violated China's sovereignty and it is not conducive to the peace and tranquillity of the border area and China is dissatisfied with this and lodged solemn representation with the Indian side," Geng said.
In its diplomatic protest to India, "China asked the Indian side to stop the activities of the devices near the border and work with China to maintain peace and tranquillity of the border areas", Geng said.
Earlier, the Chinese military alleged that an Indian drone has "intruded" into its airspace recently and crashed into the Chinese side of the border and voiced strong dissatisfaction over the incident.
The Chinese military's western theatre command jurisdiction covers almost all of the LAC and including Tibet's border region with India and the Ladakh region.
"India's move has infringed upon China's territorial sovereignty, and we are strongly dissatisfied with and opposed to this," Zhang has been quoted by state-run Xinhua news agency as saying.
Wang's visit to Delhi will be the first visit by a top Chinese official to India after the Dokalam crisis and commencement of the second five-year term for Chinese President Xi Jinping.