He said India is "not giving ground to anyone" and mentioned that two air bases are being set up in Ladakh region as part of boosting the country's defences.
"It's been always a mystery the way incursions take place and the way they get timed with various visits... It's nothing new, it remains a mystery for all of us.
He was responding when asked to comment frequent incursions by China, including the recent one when Chinese troops pushed in civilians into Indian territory in Demchok in Ladakh to prevent work on an irrigation canal being built for the people of the area.
They had pitched tents in the Indian territory which was subsequently removed on September 27 after Chinese officials met India officials in New Delhi and a decision to restore status quo to September 1 was taken.
These incidents occurred at a time with the Chinese President was on a three-day visit to India from September 17.