Jadhav, 49, a retired Indian Navy officer, was sentenced to death by the Pakistani military court on charges of "espionage and terrorism" after a closed trial in April 2017.
It further alleged that, in violation of the Vienna Convention, the authorities of Pakistan had denied India its right of consular access to Jadhav, despite repeated requests. Getting a favourable verdict is particularly important for Pakistan given that many key capitals, including Washington, have long given little credence to such Pakistani allegations against India. His sentencing evoked a sharp reaction in India.
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Pakistan claims that its security forces arrested Jadhav from restive Balochistan province on March 3, 2016, after he reportedly entered from Iran.
The minister said that the Indian request for acquittal, re-trial and release of Jadhav was rejected by the worldwide court.
The ICJ, in rejecting India's demand that Pakistan's conviction of Jadhav be set aside, did call for Islamabad to review the verdict in light of the ICJ's finding that Jadhav's right to consular access had been violated.
It did not, however, order Jadhav's return to India or annul the military court's decision as India had wanted. "I am sure Kulbhushan Jadhav will get justice".
Here in Washington, where United States officials are fervently trying to reduce worsening trade tensions with India, even as they prepare to host Pakistani Prime Minister Imran Khan next week, the ICJ verdict won't go unnoticed.
The 16-judge panel said Pakistan has to provide an "effective review" of the case and added that a "continued stay of execution" of Jadhav was needed for that to happen.
"The review and reconsideration of the conviction and sentence of Mr. Jadhav, in order to be effective, must ensure that full weight is given to the effect of the violation of the rights" in global conventions, Yusuf said.
India approached the ICJ for mediation in the case. He shall be treated in accordance with the laws of Pakistan.
Pakistan's Foreign Minister Shah Mehmood Qureshi said the ruling was "appropriate" and an endorsement of his country's stance. He refers to a 1971 case involving prisoners of war in which the two countries ended up resolving the issue bilaterally, and a 1999 case involving India's downing of a Pakistani jet in which the ICJ issued no decision at all.
An worldwide court is due to rule in a contentious case brought by India to try and save a retired Navy officer on death row in Pakistan for spying.
Second, the ICJ rules in Pakistan's favour, validating the due process followed by their military courts.
Jadhav, who was a former Indian Navy officer, was arrested by Pakistan in March 2016 and was sentenced to death a year later after being labelled a "spy" and "terrorist".