"It (awarding of death sentence to Jadhav) is unfortunate. The government, if need be, should take extreme step to save him," Thackeray told reporters here without elaborating.
Thackeray, who is in the national capital to attend a meeting of NDA leaders, did not answer queries on the details of the meet.
The Pakistan army chief today approved the execution of Jadhav for alleged "espionage and sabotage" activities.
India reacted strongly saying that execution of Jadhav would be treated be as a "premeditated murder".
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