Later, the Chinese Foreign Ministry said it has lodged a protest with India over the issue and warned New Delhi not to use such devices near the border area any more.
The unmanned aerial vehicle had "invaded" and "crashed" on the Chinese side of the border, Foreign Ministry spokesman Geng Shuang told a media briefing here.
Beijing had lodged a diplomatic protest with India over the violation of its territorial sovereignty.
Tensions between China and India at their disputed border have been reignited-over a crashed drone.More news: IT'S DONE: Same-sex marriage is officially legal in Australia!
India, however, said that the Chinese side was informed after the drone strayed into their territory.
The boundary talks were last held in Beijing in April past year but suspended as frequent border patrol confrontations culminated in the 70-day military face-off along an unmarked border at the junction of Sikkim, Tibet and Bhutan. "We express strong dissatisfaction and opposition", Zhang Shuili, a military official in China's western battle zone command, was quoted as saying in a ministry statement. Zhang said his country would defend its national sovereignty against such intrusions.
Although Chinese President Xi Jinping and Indian Prime Minister Narendra Modi agreed at a meeting in September to advance bilateral ties and leave the Doklam row behind them, tensions continue to simmer along the border months after the disengagement of troops on the plateau, known as Donglang in Chinese. But the mountainous border remains sensitive for both sides.
Sources said the drone was an Israeli Heron UAV, and that it crashed on the Chinese side of the border across north Sikkim.More news: Leonardo da Vinci's 'Salvator Mundi' bought by Saudi Prince
"The 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 the Line of Actual Control (LAC) in the Sikkim sector".
He said further details can be obtained from the Chinese military.
"The exact cause of the incident is under investigation".
Wang will attend a trilateral meeting with his counterparts from India and Russian Federation in Delhi on Monday to discuss "major global and regional issues of common interest and trilateral practical cooperation".More news: SNOW AND ICE warning upgraded by Met Éireann