Modi's visit was part of a series of public meetings in the region aimed at garnering support for his Hindu nationalist Bharatiya Janata Party ahead of Indian elections due by May. "What Arunachal Pradesh has achieved today will soon be achieved by the entire nation", he said addressing a gathering.
Beijing has raised similar objections in the past to Indian leaders visiting the state, and New Delhi has stuck to its consistent position.
"China's position on the China-India border issue is consistent and clear-cut", said Hua, adding that the Chinese government has never recognized the so-called "Arunachal Pradesh, Xinhua reported".
"China urges the Indian side to bear in mind the common interests of the two countries, respect the interests and concerns of the Chinese side, cherish the momentum of improvement in bilateral relations and refrain from any action that may lead to the escalation of disputes or complicate the boundary question", said spokesperson Hua.
Hours after China expressed its displeasure over Prime Minister Narendra Modi's visit to Arunachal Pradesh, Ministry of External Affairs asserted that the state of Arunachal Pradesh is an "integral and inalienable part" of India.More news: Trump drags Schiff again in morning Twitter screed
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The ambitious greenfield airport project in the state has been pending for several years due to controversies over site selection, they said.
He inaugurated the new Doordarshan channel for Arunachal Pradesh, DD Arun Prabha.
Inaugurating the Tezu airport in the Lohit district through remote, the PM said the airport will connect Guwahati, Jorhat and Hollongi.
The exchange, though it has happened in the past, is noteworthy as it comes after efforts to thaw ties and rebuild trust between Modi and Chinese president Xi Jinping in Wuhan previous year. Chinese president Xi Jinping is slated to visit India this year for the second informal summit.
In 2017, the two Asian giants were involved in a high-altitude standoff in Bhutan's Doklam region after the Indian army sent troops to stop the construction of a military road by China.