The reports were issued by the Atlantic Council, a Washington think-tank, and the Afghanistan Study Group co-chaired by retired U.S. Marine Corps General James Jones and Thomas Pickering, former U.S. ambassador to the UN.

Separately, British aid agency Oxfam today warned Afghanistan faces a possible humanitarian disaster unless Western nations change their strategies there by focusing more on improving the lives of ordinary Afghans.

The expert reports come amid new concerns about NATO's commitment to send more troops to Afghanistan.

Canada has threatened to pull out its 2,500 troops early next year unless NATO contributes more soldiers.