Indian army chief General Bipin Rawat visited Sikkim bordering China on Thursday, where tensions have flared after Beijing accused New Delhi of sending troops into its territory and obstructing the construction of a road.

Small incursions and troop stand-offs are common along other parts of China and India's contested 3,500 km frontier, but a flare-up near strategically positioned Sikkim is rare.

General Rawat arrived in Gangtok, before heading off to visit troop formations. A spokesman for the Indian army said the one-day trip was “routine” and planned before the recent tensions.

Reports of the incursion and a confrontation between troops emerged as Prime Minister Narendra Modi arrived in Washington to meet US President Donald Trump on Monday, the latest in a line of stand-offs reported during diplomatic initiatives.

India has deepened its military ties with the United States in recent years, worrying China, which is also unhappy with India's refusal to participate in Beijing's multi-billion-dollar Belt and Road infrastructure initiative. India is concerned the project could cement China's dominance over Asia.

According to the Chinese interpretation of events, Indian guards crossed into the Donglang region earlier in June and obstructed work on a road on a plateau. The two sets of troops then confronted each other close to a highly strategic valley controlled by China that separates India from Bhutan - a close Indian ally - and gives China access to the so-called Chicken's Neck, a slither of land that connects India to its remote northeastern regions.

China says that unlike other parts of their shared border, the delineation of the frontier with Sikkim is settled, and it has the right to develop the area. “Donglang Region is part of China's territory,” Chinese Foreign Ministry spokesman Lu Kang said on Thursday. “China's road-building activities in Donglang on its own territory are totally reasonable and understandable.”

Late on Thursday, the ministry released on its website two photographs it said showed Indian troops and at least two Indian military bulldozers on what it said was the Chinese side of the border.

The Nathu La Pass, which lies on the frontier between Sikkim and Tibet, was the site of a fierce border clash between Chinese and Indian troops in 1967.

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