Addressing an election rally here, 460 km from Mumbai, Singh also accused the previous UPA government of adopting a soft approach towards Pakistan as he raked up the issue of tension along the International Border and Line of Control.
He said Pakistan's violation of ceasefire became habitual because of the Congress regime.
"But now it has been conveyed in no uncertain terms to Pakistan that ground realties in India have changed.
"Pakistan should think twice before indulging in any ceasefire violation as the government is being headed by Narendra Modi in India," he told the rally.
If the violations continue, the army and every youth of this country are ready to give a befitting reply to Pakistan and the same has been conveyed in no uncertain terms, he said.
As many as five people were killed in Arnia village of Jammu region due to shelling from Pakistan yesterday. Firing was reported at various places today also.