Blockades for political reasons is not only India's tactics. China has done that to Mongolia, Pakistan has done that to Afghanistan.
Sir, IMO Pakistan's move against Afghanistan could not be called a blockade for political reason but not to allow trade which is security concern for Pakistan. If you do analysis, security situation improved many folds after such restrictions and border management. We done our home work and eliminated one of the basic.
After 17 years, doing so much butchery finally US realized the need of dialogue and if US is sincere for peace, in future, the security situation will improve further.