Mehmood attacked the government for selecting a lawyer at the ICJ "who had not a single worldwide law case reported from the UK Supreme Court".
The UN's highest court rejected Pakistan's argument that it had no jurisdiction in Jadhav's case as it involved national security issues and accepted India's contention about the urgency of the matter.
While presenting arguments, Pakistani counsel had informed ICJ that Jadhav, 46, was arrested in March a year ago in the restive Balochistan province.
She said Pakistan has presented dossiers to the United Nations regarding Kulbhushan Jhadav's involvement in terrorist and subversive activities in Pakistan.
"Pakistan's security is so important and we have to maintain our fundamental sovereign right", Aziz was quoted as saying by the daily.More news: Netanyahu: Moving US Embassy in Israel to Jerusalem Will 'Advance' Peace
Mr Jadhav was "an innocent Indian national, who, incarcerated in Pakistan for more than a year on concocted charges has been held incommunicado... and faces imminent execution", India told the tribunal. "But (Jadhav) can not be executed until the stay order is there", Usmani said.
Meanwhile, Pakistan said the ICJ's decision has not changed the status of Jadhav's case in any manner.
The lawyer further justified the ICJ's decision to deliver a quick ruling a mere 10 days after India filed its case at the Hague court.
Referring to Osama Bin Laden's compound in the Pakistan military academy, Mengal called upon the worldwide community to take action against Pakistan which is promoting religious terrorism across the world and the terrorists who are operating under the patronage of Pakistan intelligence agencies.
Jadhav's case is the latest flashpoint in the tensions between Pakistan and India.More news: New Telegram update brings video messages, ability for bots to accept payments
But India has maintained he is not a spy, and has accused Pakistan of violating the Vienna Convention by failing to provide him with consular access, as well as breaking global human rights law.
The International Court of Justice (ICJ) on Thursday ordered Pakistan to stay the execution of Yadav convicted of spying.
Earlier, the ICJ stayed the execution and upheld India's right to have consular access to the former naval officer. He said the court considers that it has prima facie jurisdiction in the matter as there is a dispute between the parties.
Before the ICJ India can only argue that the route taken by Pakistan to arrive at a death sentence is violative of the principles of Vienna Convention which is a multilateral treaty, Harish Salve explains.More news: The Public Pulse: Clearing up some health care misconceptions
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