US President Donald Trump said on Wednesday that he was 'ready, willing and able' to 'mediate or arbitrate' the raging border dispute between India and China, amid the continuing standoff between the militaries of the two neighbours at the Line of Actual Control (LAC).

Trump previously offered to mediate between India and Pakistan, a proposal rejected by New Delhi which maintains that there is no role for any third party in bilateral issues.

'We have informed both India and China that the United States is ready, willing and able to mediate or arbitrate their now raging border dispute. Thank you!' Trump said in an early morning tweet.

The nearly 3,500-km-long LAC is the de-facto border between India and China.

Several areas along the LAC in Ladakh and north Sikkim have witnessed major military build-up by both the Indian and Chinese armies recently, in a clear signal of escalating tension and hardening of respective positions by the two sides even two weeks after they were engaged in two separate face-offs.

India has said the Chinese military was hindering normal patrolling by its troops along the LAC in Ladakh and Sikkim and strongly refuted Beijing's contention that the escalating tension between the two armies was triggered by trespassing of Indian forces across the Chinese side.

The ministry of external affairs said all Indian activities were carried out on its side of the border, asserting that India has always taken a very responsible approach towards border management. At the same time, it said, India was deeply committed to protect its sovereignty and security.

'Any suggestion that Indian troops had undertaken activity across the LAC in the Western sector or the Sikkim sector is not accurate. Indian troops are fully familiar with the alignment of the Line of Actual Control in the India-China border areas and abide by it scrupulously,' MEA spokesperson Anurag Srivastava said at an online media briefing last week.