How India won the legal battle for Kulbhushan Jadhav

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What happened?
It was on March 25, 2016, that then Foreign Secretary of Pakistan, Aizaz Ahmad Chaudhry, had informed the Indian High Commissioner in Islamabad of Jadhav's "arrest."
Since then, Pakistan has not offered any explanation as to why Islamabad took over three weeks to inform the Indian High Commissioner about Jadhav's arrest.
Jadhav was sentenced to death by a Pakistani military court on April 11, 2017.
PTI

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Battle at ICJ
According to India, Jadhav was denied the right to be defended by a legal counsel of his choice. His conviction and death sentence was based on "confessions" taken in captivity, India maintained.
ANI

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The trial
Jadhav was purportedly "arrested" on March 3, 2016, and it was only on March 25, 2016, that the Pakistani foreign secretary informed the Indian high commissioner in Islamabad of this "arrest". According to Indian authorities, Pakistan never offered any explanation as to why it took over three weeks to inform the Indian high commissioner of Jadhav's arrest.
Pakistan violated the Vienna Convention also by not informing Jadhav of his rights and by denying Indian officials access to him.
ANI

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India's counter
It was said to be in brazen defiance of the rights and protections provided under the Vienna Convention and the international law, including ICCPR (International Covenant on Civil and Political Rights). The jurisprudence on 'human rights', including under the ICCPR, recognises 'due process' rubric.
Perhaps the most important aspect was the way India countered Pakistan's claim that the 2008 bilateral agreement overrode the Vienna Convention.
AFP

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The big win
India found the use of military courts for trial of civilians violative of process standards. "Trial of foreign national civilians by military courts is per se violative of the ICCPR, and of minimum standards recognised as 'principles of international law'," said an official.
AFP