Pillai was speaking at the Institute of Defence Studies and Analysis in New Delhi.
"Documents which were found revealed that the Maoist agenda was to overthrow the Indian state by 2050, possibly with the help of ex-Armymen," Pillai said.
"Maoists were not serious about talks because they weren't under enough pressure to do so," Pillai said.
"Right now, Maoists were looking to regroup and build their own army towards their plans," he said adding that they were using administrative vacuum and under development to do this.
Pillai added that the only way to fight them was through development.
Earlier, Home Minister P Chidambaram had asked Maoists to abjure violence and asked them to contact for peace talks.