Chinese troops are reinforcing their posts in large numbers, increasing their patrolling, stepping up violations in the Tawang and Walong areas.
Ajai Shukla reports.
With Chinese and Indian troops eyeball to eyeball at seven places inside India's claimed territory in Ladakh and Sikkim, China's People's Liberation Army has begun stepping up activity opposite Arunachal Pradesh as well.
Indian government sources say PLA troops are reinforcing their posts in large numbers, increasing their patrolling and stepping up violations of the Indian border, which in Arunachal Pradesh runs along the McMahon Line.
The two sectors that are seeing the most PLA activity are Tawang and Walong -- both of which bore the brunt of the Chinese offensive in 1962.
In the Tawang area, PLA patrols have come up to India's Old Khinzemane post on two occasions, and accosted the Indian troops there.
Khinzemane is right on the McMahon Line and was the point at which the Dalai Lama entered India after escaping from Lhasa in March 1959.
Khinzemane is located close to the Namka Chu river, where the Chinese launched the 1962 war with their first massed attacks on thinly held Indian defences.
Also in the Tawang sector, the PLA has reinforced its base camp at Tsona Dzong, the main Tibetan border town located across the McMahon Line from Tawang.
In the Walong sector, which is at the eastern-most tip of India, sources report aggressive activity from Chinese patrols at the Indian border post of Kibithoo.
The PLA patrols, which have been coming right up to the border, are far more frequent and now include more than 40 soldiers in each -- almost twice the number in normal times.
The PLA camp at Old Tatu, across the border from Kibithoo, has also been heavily reinforced.
There are also reports of heavy reinforcements being moved to Rima, the border town across the McMahon Line from Walong.
There is also aggressive Chinese activity in the Asaphila sector, which the Chinese attacked and captured in the 1962 War.
Over preceding days, there have been multiple PLA incursions across the McMahon Line here, say sources. The Chinese have established temporary camps, just across the border from the Kepang La and Sying La passes.
In the Upper Siang border district, where the Tsang Po river flows into India and becomes the Siang, and then the Brahmaputra, there have been a large number of border transgressions in recent days.
India's military intelligence is assessing whether the PLA is reinforcing the sector to guard against the eventuality of an Indian attack, or whether the Chinese have plans to occupy Indian territory here as it did in Ladakh.
While there has been no occupation of Indian territory in Arunachal Pradesh yet, as there has in Ladakh, the army is taking the Chinese activity seriously.
In Ladakh, in April, the army misread PLA activity as routine training. It is determined not to make the same mistake in Arunachal Pradesh.
The seven areas in Ladakh that have Chinese troops squatting on Indian territory are: Bottleneck in the Depsang area; Jeevan Nullah, the Y-Nullah in the Galwan River valley; Patrolling Point-15 in Galwan; Gogra Heights at PP-17; Chushul, and the north bank of Pangong Lake up to Finger 4.