Regarding Law in the international Law countries don't provide councilor access to Terrorist. It is part of the Law no councilor access to terrorist.
Now back to your terrorism issue of Jadhav being a terrorist or not. Here this is a real story from where it all boiled down.
19 die as car bomb hits convoy of pilgrims
The blast occurred in Mastung, hometown of Balochistan Chief Minister Aslam Raisani, where numerous attacks on the convoys of the pilgrims have been reported during the last couple of years.
“Nineteen bodies have been retrieved from the wreckage of a passenger bus, Deputy Commissioner Mastung Tufail Baloch told The News. The deceased belonged to Lahore, Jhang and Multan.
https://www.thenews.com.pk/archive/print/627523-19-die-as-car-bomb-hits-convoy-of-pilgrims
Many people who died in this attack was from my village and Iran cannot save Jadhav ***. There is more than enough prove on him collected from Iran. Which stands against Jadhav. Why do you think Iran deserted you?