There's a sense of desperation in Afghanistan because of the lack of funding and the fact that the U.S. only has a one-track military strategy. It doesn't have an economic and political game plan.

I met a lot of the senior Taliban, and I asked them precisely [about Mullah Omar]. The most common answer was he is humble. And that was very true. We never had reports of Mullah Omar living luxuriously or making money in large quantities or anything like that.

There's a sense of desperation in Afghanistan because of the lack of funding and the fact that the U.S. only has a one-track military strategy. It doesn't have an economic and political game plan.

You have a lot of suspicion from the neighbors of Afghanistan about U.S. intentions. Iran is already, to some extent, trying to undermine the U.S. in Afghanistan. Russia is now becoming increasingly nervous about a more permanent U.S. presence in Central Asia. And China is not keen that the U.S. should be so close to its borders over a long period of time. Certainly, if the U.S. is going to be there for a long time, it's going to exacerbate regional tensions.

The strategy for peace-building in Afghanistan is economic aid, reconstruction, international security forces. On those lines, the U.S. has been extremely slow. And it has even blocked expanding security forces from Kabul to other cities.

What everyone underestimated was the acute unpopularity of the Taliban, even in the Pashtun areas. People like myself were saying the Taliban would be driven out very swiftly from the north of Afghanistan, but given that their main support base was in the Pashtun belt, there would be greater resistance there. That didn't happen. The Taliban had become deeply unpopular and were actually discarded by the Pashtun population almost as quickly as they were in the north. I don't see the Taliban coming back in any way.

The biggest mistake Barack Obama could have made is to change quite a few things in his Afghanistan policy. He increased the number of troops and at the same time set the US withdrawal date to 2014. Now the United States has to ensure that Afghanistan does not immediately collapse after being left to itself in 2014.