Reacting sharply to Prime Minister Modi's visit to Arunachal Pradesh, foreign ministry spokesperson Geng Shuang said China would lodge a "stern" diplomatic protest with India.
"China's position on the China-India boundary question is consistent and clear-cut," said Chinese foreign ministry spokesperson Geng Shuang in response to reports that Modi visited Arunachal Pradesh today.
"The Chinese government has never recognised the so-called Arunachal Pradesh and is firmly opposed to the Indian leader's visit to the disputed area," Geng was quoted as saying by state-run Xinhua news agency.
Geng said that China and India had reached important consensus on properly managing disputes, and the two sides were working to resolve the territorial disputes through negotiation and consultation.
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"The Chinese side urges the Indian side to honour its commitment and abide by the relevant consensus, and refrain from taking any action that may complicate the boundary question," Geng said.
"(These three areas) located between the illegal 'McMahon Line' and the traditional customary boundary between China and India, have always been Chinese territory," he was quoted as saying in the Xinhua report.
He urged India to cherish the hard-won momentum of improvements in bilateral relations and create enabling conditions for the boundary talks and the development of bilateral relations.
China routinely protests visits by Indian leaders to Arunachal Pradesh and reiterates its claims over the frontier state.
China had objected to the then US Ambassador to India Richard Verma's visit to Arunachal Pradesh in October last year.
The India-China border dispute stretches across 3,488 kms. Both sides have held 20 rounds of talks so far through their Special Representatives to resolve the issue.