TAIPEI, Aug 25 (Reuters) - Taiwan will next year begin deploying drone defence systems on its offshore islands, the defence ministry said, after footage emerged of Taiwanese soldiers throwing stones at a Chinese drone that buzzed a guard post near China's coast.

Taiwan has complained of repeated Chinese drone incursions near its offshore islands as part of China's war games and drills after U.S. House Speaker Nancy Pelosi's visit to Taipei this month, which infuriated Beijing.

China claims democratically governed Taiwan as its own territory, despite the strong objections of the government in Taipei.

The brief video clip, circulated first on Chinese social media before being picked up by Taiwanese media, shows two soldiers throwing stones at a drone that got near their guard post.

In a statement late Wednesday, the defence command of Kinmen, a group of Taiwan-controlled islands that sit opposite China's Xiamen and Quanzhou cities, said the incident occurred on Aug. 16 on Erdan islet, and confirmed the soldiers had thrown stones to see off what it called a civilian drone.

China claims democratically governed Taiwan as its own territory, despite the strong objections of the government in Taipei.

The brief video clip, circulated first on Chinese social media before being picked up by Taiwanese media, shows two soldiers throwing stones at a drone that got near their guard post.

In a statement late Wednesday, the defence command of Kinmen, a group of Taiwan-controlled islands that sit opposite China's Xiamen and Quanzhou cities, said the incident occurred on Aug. 16 on Erdan islet, and confirmed the soldiers had thrown stones to see off what it called a civilian drone.

It has also triggered heated discussion in Taiwan, with some social media users calling the incident a "humiliation" for the island's armed forces and urging the defence ministry to step up its countermeasures to the increasingly frequent drone incursions.

The Kinmen defence command said the footage was another example of China's "cognitive warfare" against Taiwan and an attempt to "denigrate" its armed forces.

Wang Ting-yu, a senior lawmaker of Taiwan's ruling Democratic Progressive Party, described the incident as "very serious" and questioned why Taiwan's defence ministry did not respond to the incursion.

"The drone was flying on top of our soldiers on guard but there's zero response," he said. "If you just let them come and go freely, this was negligence of duty."

Taiwan has controlled Kinmen, along with the Matsu islands further up China's coast, since the defeated Republic of China government fled to Taipei after losing a civil war with Mao Zedong's Communists in 1949.

At its closest point, Chinese-controlled territory is only a few hundred metres from Kinmen.