Pakistan's "foolishness" will cost them, Ahir stressed.
"India will not forgive Pakistan's actions. It will prove to be Pakistan's foolishness and will cost them," he told reporters here.
Asked if anti-tank missiles had been fired by Pakistan, Ahir said, "So far there is no such information".
"But it is true that Pakistan has been violating ceasefire repeatedly. We will give them a befitting response. We won't leave them," the minister said.
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Meanwhile, the Shiv Sena said in New Delhi that it was time India gave a "befitting response" to Pakistan.
"Civilians are getting killed. And we keep saying that we will avenge their deaths. Don't we also have missiles," Sena leader Sanjay Raut said today.
He wondered if Indian missiles were only meant for display.
"If Pakistan attacks our army jawans with missiles, then are our missiles only for display at Rajpath during the Republic Day parade and for (getting) claps (from the crowds)," he asked.
Pakistan's actions were demoralising Indian troops, he added.
"Pakistan has been repeatedly intruding into Indian territory and killing our soldiers. This is demoralising our soldiers," Raut said.