From Matt Smith, CNN
March 11, 2013 -- Updated 0601 GMT (1401 HKT)
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Afghan President Hamid Karzai contends the Taliban prefers that foreign troops remain in the country.
(CNN) -- The commander of the NATO-led forces in Afghanistan has taken exception to President Hamid Karzai's contention that the United States and the Taliban were holding daily talks, and that the militant group prefers that foreign troops remain in the country.
"We have fought too hard over the past 12 years. We have shed too much blood over the past 12 years. We have done too much to help the Afghan Security Forces grow over the last 12 years to ever think that violence or instability would be to our advantage," said Marine Gen. Joseph Dunford, the commander of the International Security Assistance Force.
On Sunday, after a weekend bombing in Kabul that killed at least nine people, Karzai said there are "ongoing daily talks between Taliban, American and foreigners in Europe and in the Gulf states."
Saturday's attack, Karzai said, shows "that Taliban want longer presence of foreigners -- not their departure from Afghanistan."
'No reason to support instability'
Dunford took exception to that characterization.
"President Karzai has never said to me that the United States was colluding with the Taliban. All I can do is speak for the coalition to tell you that it's categorically false, and that we have no reason to be colluding with the Taliban," he said.
"We have no reason to be supporting instability in Afghanistan. And all that we have been about over the past 12 years is to bring peace and stability to the Afghan people so that they can take advantage of the decade of opportunity that will follow 2014."
The United States plans to wind up its 11-year combat mission in Afghanistan by the end of next year.
Dinner to smooth things over
On Sunday, several hours after Karzai made his remarks, he met with U.S. Defense Secretary Chuck Hagel over dinner in the Afghan capital.
The meeting was an attempt to smooth over the latest dispute in the already strained relationship between the two allies.
Hagel told reporters he tried to reassure Karzai that the United States had no unilateral back-channel talks with the Taliban.
"The fact is, any prospect for peace or political settlements -- that has to be led by the Afghans. That has to come from the Afghan side," Hagel said. "Obviously, the United States will support efforts if they are led by the Afghans to come to some possible resolution."
Hagel, a former senator who took the helm at the Pentagon last month, made his first trip to Afghanistan as defense secretary.
Karzai, meanwhile, has been increasingly critical of American forces in recent months.
While there have been reconciliation talks in the past, the United States has not said any such talks are currently underway with the Taliban.
In January, a U.S. official said reconciliation talks were showing "some signs of life" after being dormant for a year.
News conference canceled
Hagel's dinner with the Afghan leader in Kabul came after a scheduled joint news conference between the two was canceled. Pentagon spokesman George Little said the schedule had changed "for a variety of reasons, to include decisions related to security in Kabul that were reached in consultation with our Afghan partners."
"I know these are difficult issues for President Karzai and the Afghan people," Hagel said after the meeting. "I was once a politician, so I can understand the kind of pressures that especially leaders of countries are always under. I would hope, again, that we can move forward, and I have confidence that we can and will deal with these issues."
Taliban:Attack a message to Hagel
The Taliban claimed responsibility for Saturday's attack at the Afghan defense ministry in Kabul, which killed at least nine people and wounded 14 others.
A Taliban spokesman expressed pleasure with Hagel's proximity at the time, calling the attack "a message to him."
ISAF rejected suggestions that the Taliban even knew of Hagel's trip when they planned the operation.
Tensions ahead of pullout
Afghanistan's National Security Council, chaired by Karzai, recently accused "armed individuals named as U.S. special force" of torturing and murdering innocent people in Wardak province. The government demanded members of the elite U.S. military units leave the province west of Kabul.
But the council also said the United States rejected such suggestions.
U.S. military officials said all allegations of misconduct are taken seriously, and that the military was looking into the allegation.
Last year, Karzai called for U.S. troops to pull out of outposts in Afghan villages and return to their main bases.
In October, he complained the United States was failing to supply Afghan forces with weapons needed to fight insurgents.
Then-U.S. Defense Secretary Leon Panetta responded at the time that "it would be helpful if (Karzai), every once in a while, expressed his thanks for the sacrifices that have been made by those who have fought and died for Afghanistan, rather than criticizing them."
The Obama administration is making decisions about bringing troops home.
In January, Panetta reiterated his opposition to pulling out all U.S. troops by 2014, saying it would take away negotiating leverage with the Taliban.
"The stronger position we take about staying, the better chances we have to ultimately reach political reconciliation," Panetta told journalists.
