The father of Major Sandeep Unnikrishnan, the National Security Guard commando killed while fighting terrorists during the 26/11 terror attacks in Mumbai, has said Tahawwur Rana's long-awaited extradition to India was not a diplomatic success, but also "revenge" for the general public. Speaking to NDTV over the phone, K Unnikrishnan said Rana's extradition does not provide closure and David Coleman Headley, key conspirator of the 2008 terror attack, needs to be brought back too.