The wars in Iraq and Afghanistan could cost as much as $2.4 trillion through the next decade, the nonpartisan Congressional Budget Office said .
According to analysis, the U.S. has already spent about $604 billion on the wars .
Nato has "lost in Afghanistan" and its failure to bring stability there could provoke a regional sectarian war "on a grand scale", according to Lord Ashdown . The former United Nations High Representative for Bosnia and Herzegovina delivered his dire prediction after being proposed as a new "super envoy" role in Afghanistan.
Lord Ashdown said: "We have lost, I think, and success is now unlikely."