Saeed, the mastermind of the 2008 Mumbai attacks, said "I don't believe in the fantasy that India can ever attack Pakistan".
"This is not the Pakistan of 1971....Our nukes are not for museum either," he said in an interview to Express News Channel.
His twitter account was simultaneously updated.
"Pakistan's restrained policy is being taken as weakness. Government should review its stance. War or peace is India's choice," Saeed, the former head of banned Lashkar-e-Taiba, said.