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India is taking Pakistan to the United Nations' highest court in an attempt to spare an alleged spy from execution, in a case that has exacerbated tensions between the longtime rivals.

In a hearing Monday at the International Court of Justice, India is laying out its case that Pakistan breached the rights of Kulbhushan Jadhav following his arrest by not allowing him access to consular officials or the right to choose his own defense lawyer.

Jadhav was arrested by Pakistan in March 2016 after he allegedly entered the country from Iran. Pakistani officials say he has been linked to 1,345 deaths in acts of terrorism in Pakistan, making secret trips to the country from Iran.

He was convicted in Pakistan by a military tribunal and sentenced to death in April 2017.