Pakistan's army has said it will launch no new offensives on militants in 2010, as the US defence secretary arrived for talks on combating Taliban fighters.
Army spokesman Athar Abbas told the BBC the "overstretched" military had no plans for any fresh anti-militant operations over the next 12 months.
Our correspondent says the comments are a clear snub to Washington.
The US wants Pakistan to expand an offensive against militants launching cross-border attacks in Afghanistan.
Defence Secretary Robert Gates arrived in Pakistan on Thursday for his first visit since US President Barack Obama took office last year.
The one-day trip comes at a crucial time in the fight against al-Qaeda and the Taliban, with the US planning to commit 30,000 more troops to Afghanistan.
The Pakistani army launched major ground offensives in 2009 in the north-west against Pakistani Taliban strongholds in the Swat region, last April, and in South Waziristan, last October.
The militants have hit back with a wave of suicide bombings and attacks that have killed hundreds of people across Pakistan.
In the Pakistani capital, Islamabad, on Thursday, Maj Gen Abbas, head of public relations for the Pakistan army, told the BBC: "We are not going to conduct any major new operations against the militants over the next 12 months.
"The Pakistan army is overstretched and it is not in a position to open any new fronts. Obviously, we will continue our present operations in Waziristan and Swat."
The BBC's Syed Shoaib Hasan in Islamabad says the comments are a clear brush-off to top US officials, and are likely to put Pakistan's shaky coalition government in an embarrassing position with its US ally.
He says the move also threatens to make any expanded Nato and US military deployment in Afghanistan ineffective, as the Taliban will now be relieved of any pressure from the Pakistan army.
Before he arrived in Islamabad, Mr Gates told reporters travelling with him from India: "You can't ignore one part of this cancer and pretend that it won't have some impact closer to home."
His visit comes amidst a slight deterioration in relations between the two allies. In an article published in a Pakistani newspaper on Thursday, Mr Gates referred to a "trust deficit".
He is expected to hold discussions with Prime Minister Yousuf Raza Gilani and President Asif Zardari.
Talks were also expected to focus on US drone strikes against militants near the Afghan border.
Hundreds of people have died in the attacks, which have stoked deep resentment of the US among many Pakistanis.
Our correspondent says there is further public concern in Pakistan over the expanding presence of US government personnel in the country.
But he adds that Mr Gates will argue that drone strikes are the only effective measure against the Taliban and that stationing US personnel in Pakistan is essential to ensure it receives the expertise needed to implement the massive US aid package.
Pakistan has been an important US partner in South Asia since the 11 September 2001 attacks in the US.