President Donald Trump said on Wednesday he has offered to mediate a standoff between India and China at the Himalayan border.

"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," Trump said in a Twitter post.

The standoff was triggered by India’s construction of roads and air strips in the region as it competes with China's spreading Belt and Road initiative, Indian observers said on Tuesday.