Hours after China's claim that an Indian drone had "intruded into" its airspace, the army said in a statement that a drone had crossed over into Chinese territory after a technical problem and their soldiers had been alerted in keeping with protocol.
The two nations fought a bitter war over the border in 1962, and disputes remain unresolved in several areas which cause tensions to rise periodically. "In response, Chinese side reverted with location details. The matter is being dealt with in accordance with established protocols", it added.
Chinese Foreign Minister Wang Yi will attend the Russia-India-China (RIC) foreign ministers' trilateral meeting next week in New Delhi where he will also hold talks with top Indian officials, the first high-level dialogue after President Xi Jinping commenced his second term.
"India's move has infringed upon China's territorial sovereignty, and we are strongly dissatisfied with and opposed to this", Zhang Shuili, deputy head of the combat bureau of the Western Theatre Command's joint staff department, told Xinhua.
"China's border defence forces took a professional and responsible attitude in conducting an inspection of the device", Zhang said, adding that the military would resolutely defend national sovereignty and security.
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Chinese military's western theatre command jurisdiction covers nearly all of the 3488-km LAC, including Tibet's border region with India and the Ladakh region.
The drone report comes months after the border stand-off near Doklam in Sikkim sector.
Indian and Chinese troops confronted each other between June and August this year - at one stage even resorting to scuffling and throwing stones - on a remote plateau near the borders of India, its ally Bhutan, and China, in the most serious and prolonged standoff in decades.
Though India may raise the contentious issues, it will highlight the need for joining hands by the three countries to pursue common strategic interests in the region, it is learnt.