An open letter from Afghanistan experts to Barack Obama:

To the President of the United States: Mr. President, We have been engaged and working inside Afghanistan, some of us for decades, as academics, experts and members of non-governmental organisations. Today we are deeply worried about the current course of the war and the lack of credible scenarios for the future. The cost of the war is now over $120 billion per year for the United States alone.

This is unsustainable in the long run. In addition, human losses are increasing. Over 680 soldiers from the international coalition – along with hundreds of Afghans – have died this year in Afghanistan, and the year is not yet over. We appeal to you to use the unparalleled resources and influence which the United States now brings to bear in Afghanistan to achieve that longed-for peace.

Despite these huge costs, the situation on the ground is much worse than a year ago because the Taliban insurgency has made progress across the country. It is now very difficult to work outside the cities or even move around Afghanistan by road. The insurgents have built momentum, exploiting the shortcomings of the Afghan government and the mistakes of the coalition. The Taliban today are now a national movement with a serious presence in the north and the west of the country. Foreign bases are completely isolated from their local environment and unable to protect the population. Foreign forces have by now been in Afghanistan longer than the Soviet Red Army.

Politically, the settlement resulting from the 2001 intervention is unsustainable because the constituencies of whom the Taliban are the most violent expression are not represented, and because the highly centralised constitution goes against the grain of Afghan tradition, for example in specifying national elections in fourteen of the next twenty years.

The operations in the south of Afghanistan, in Kandahar and in Helmand provinces are not going well. What was supposed to be a population-centred strategy is now a full-scale military campaign causing civilian casualties and destruction of property. Night raids have become the main weapon to eliminate suspected Taliban, but much of the Afghan population sees these methods as illegitimate. Due to the violence of the military operations, we are losing the battle for hearts and minds in the Pashtun countryside, with a direct effect on the sustainability of the war. These measures, beyond their debatable military results, foster grievance. With Pakistan’s active support for the Taliban, it is not realistic to bet on a military solution. Drone strikes in Pakistan have a marginal effect on the insurgency but are destabilising Pakistan. The losses of the insurgency are compensated by new recruits who are often more radical than their predecessors.