Omer Khalid Khorasani, the Islamist commander of Mohmand Agency, one of seven lawless tribal districts in the country's northwest, said in a letter to the media that he was not hopeful about the outcome of peace overtures.
"The current wave in support of the talks is bound to fail as we have come to the conclusion that the government is not serious," said Khorasani.
"The main difference is that we want to change the Constitution (with Shariah or Islamic law) and the army is demanding from us to follow the Constitution," he said.
Khorasani said the second biggest hurdle in the way of peace is that the Taliban's demand for implementing Islamic law is for the entire country and not just the tribal region.
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"We will support the mujahideen living in areas other then tribal region. We will not leave them and live and die together," he said.
The letter was issued amidst reports of rifts among Taliban factions circulating in the media. Some of the reports are highly credible and have been confirmed by Taliban sources.