A US envoy said Monday that Washington still hoped to talk directly with the Taliban to support an Afghan peace deal but that the militants seemed unwilling to do so.
The Taliban opened an office in the Qatari capital Doha in June aimed at talking to the United States ahead of next year's withdrawal of most American troops, but diplomacy collapsed before it even began.
"We would still like to see that dialogue initiated, a dialogue that would involve the US and Taliban directly but would also involve the Afghan government or its High Peace Council," said James Dobbins, the US special representative on Afghanistan and Pakistan.
"We're not giving up hope. We continue to hope that there will be a positive development at some point, but we can't predict when," Dobbins, who was expected to lead the US side at talks, told reporters in Washington.
"The Taliban are now, as a practical matter, unwilling to engage with the United States, with the Afghans, with anybody," he said.
The Taliban office in Doha styled itself as an embassy of a government-in-exile from the Islamists' 1996-2001 reign, angering Afghan President Hamid Karzai who briefly pulled out of separate talks with the United States on a post-2014 security agreement.
In turn, the Taliban refused to talk to Karzai, calling him a US puppet, even though the United States had hoped for the Afghan government to play the main role in talks with the Taliban.
Dobbins blamed a "genuine misunderstanding" over the role of the office.
President Barack Obama has promised the war-weary US public to pull combat troops out of Afghanistan next year, ending the longest US war that was launched after the September 11, 2001, attacks.
The United States has set a goal of concluding the security agreement with the Afghan government next month.