Recently, when PM Modi visited Arunachal Pradesh, China got very irritated.
China opposed this visit and considered Arunachal Pradesh as its part. However, now America has rubbed salt into China's wounds. US government spokesperson Vedant Patel told Soi Jhatki that the US recognizes Arunachal Pradesh as part of India and opposes any unilateral attempt to claim the territory through military action or incursions along the Line of Actual Control between India and China. Resists the effort.
Naturally, Vedant Patel was pointing towards China and without taking names he gave a red flag to China against US intrusion in the Line of Actual Control area.
China always hovers over the lands of other countries and India's Arunachal Pradesh is also no exception to this. China knows Arunachal Pradesh as South Tibet and China protests whenever Indian leaders visit the state. China has also named Arunachal Pradesh as Jangnan.
On March 9, PM Modi dedicated to the country the Sela Tunnel built at an altitude of 13500 feet in this state. Which is going to prove very helpful for the movement of troops till the border of Arunachal Pradesh.
After PM Modi's visit, China said that Arunachal Pradesh is an integral part of China. However, America has rejected China's claim.