According to Indian media, US Ambassador to New Delhi Richard Verma visited last week a disputed area in the Arunachal Pradesh state in northeast India to participate in the annual Tawang festival. On October 21, Verma posted a photo on his Twitter account of his visit to Arunachal Pradesh.
"We express our resolute protest over the visit by the US diplomat to the disputed area between India and China… Any third responsible party should respect the efforts taken by India and China for peace and stability and not vice versa. However, US behavior contradicts the China-India efforts," Lu said at a briefing.
The spokesman urged Washington to stop interfering into the territorial dispute between the two states.
The two Asian nations have several territorial disputes over parts of their 2,100-mile border, such as around a part of India's Arunachal Pradesh, which is considered to form part of China's Tibet by Beijing. Repeated rounds of talks have failed to lead to some progress so far.