Where do things stand? What's the future of the Islamabad talks? And now what should we expect?

As uncertainty about the talks that were supposed to happen between America and Iran continues, we ask can the Pakistan-brokered talks still happen? If they do how significant will that be? In these circumstances what can they deliver? What does the confusion of the last two days suggest about America and Iran? And where does the advantage lie? Those are the key issues Karan Thapar raises with the well-known and highly regarded Iran Project Director of the International Crisis Group, Ali Vaez.