However, there is no official figure about the numbers.Sources said satellite images have captured significant ramping up of defence infrastructure by China on its side of the de-facto border including construction activities at a military airbase around 180 kms from the Pangong Tso area.
The assessment by the Indian Army
is that the build up is aimed at putting pressure on India.
"We are well aware of the Chinese ploy. The Indian Army is firm on its stand that we are not going to accept anything less than restoration of status quo in the area," said a senior military official.
Defence Minister Rajnath Singh on Saturday said bilateral talks were on at military and diplomatic levels with China to resolve the row.
The trigger for the face-off was China's stiff opposition to India laying a key road in the Finger area around the Pangong Tso Lake besides construction of another road connecting the Darbuk-Shayok-Daulat Beg Oldie road in Galwan Valley.
The sources said China was also laying a road in the Finger area which is not acceptable to India.
The sources said military reinforcements including troops, vehicles and artillery guns were sent to eastern Ladakh by the Indian Army to shore up its presence in the areas where Chinese soldiers were resorting to aggressive posturing.
The situation in eastern Ladakh deteriorated after around 250 Chinese and Indian soldiers were engaged in a violent face-off on the evening of May 5 which spilled over to the next day before the two sides agreed to "disengage".
However, the standoff continued.The incident in Pangong Tso was followed by a similar incident in north Sikkim on May 9.
The troops of India and China were engaged in a 73-day stand-off in Doklam tri-junction in 2017 which even triggered fears of a war between the two nuclear-armed neighbours.
The India-China border dispute covers the 3,488-km-long LAC. China claims Arunachal Pradesh as part of southern Tibet while India contests it.
Both sides have been asserting that pending the final resolution of the boundary issue, it is necessary to maintain peace and tranquility in the border areas