What's behind the India-China border stand-off?

For four weeks, India and China have been involved in a stand-off along part of their 3,500km (2,174-mile) shared border.

The two nations fought a war over the border in 1962 and disputes remain unresolved in several areas, causing tensions to rise from time to time.

Since this confrontation began last month, each side has reinforced its troops and called on the other to back down.

How did the row begin?

It erupted when India opposed China's attempt to extend a border road through a plateau known as Doklam in India and Donglang in China.

The plateau, which lies at a junction between China, the north-eastern Indian state of Sikkim and Bhutan, is currently disputed between Beijing and Thimphu. India supports Bhutan's claim over it.