India, he asserted, is committed to safeguarding national security, including through maintenance of credible minimum nuclear deterrent.
"India is willing to address all outstanding bilateral issues with Pakistan through bilateral peaceful means. However, continued support by Pakistan to terrorism directed at us from the territory under Pakistan's control has prevented creation of necessary environment.
"Government has urged Pakistan on several occasions to fulfil its assurances, given and reiterated at the highest level, to put an end to anti-India activities on its soil and territories under its control," said Singh told the Lok Sabha in reply to a question.
He referred to reported comments of Pakistan's Defence Minister Khwaja Asif that "use of nuclear weapons is an option as they are not merely kept for show as deterrents".
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The Minister also quoted Pakistan Prime Minister's adviser on foreign affairs Sartaj Aziz who had said, "Pakistan has been maintaining the stock of its nuclear arms at a minimum deterrence level against its conventional enemy (India)."
Singh also mentioned about Pakistan Foreign Secretary Aizaz Ahmad Chaudhry's remark that Islamabad was fully capable of responding to any Indian aggression as it has developed short-range tactical nuclear weapons.