Development of infrastructure and operational capabilities to achieve desired defence preparedness to safeguard sovereignty, territorial integrity and security of India are an ongoing activity, he said in a written reply.
The government "is aware of China's military modernisation and infrastructure development along the India-China border. Government reviews the threat perceptions which impact national security regularly and initiates required measures," he said.
On whether cases of intrusions by Chinese Army in Arunachal Pradesh have come to light, he said such incidents are taken up through established mechanisms.
Incidents of transgressions are taken up with the Chinese side through established mechanisms of Hot Lines, Flag Meetings, Border Personnel Meetings and normal diplomatic channels, he said.
To a separate question on the visit of a military delegation to China recently, Antony said, "The purpose of these visits is to promote mutual trust and confidence between both countries.