(AP) — The Pakistani army said Thursday it cannot expand its offensive against militants for at least six months, and the United States backed off public pressure on an ally considered vital in the war next door in Afghanistan.

Remarks from the Army's chief spokesman during a visit by U.S. Defense Secretary Robert Gates did not rule out the offensive the United States would like to see, against militants who target U.S. forces in Afghanistan from hideouts in Pakistan.

"We are not talking years," Maj. Gen. Athar Abbas told reporters traveling with Gates. "Six months to a year" would be needed before Pakistan could consolidate the gains it has made against militants in other parts of the country and then consider going further, he said.

"By a lot of hard work we brought public support on board," for campaigns last year in the Swat valley and South Waziristan, he said.

U.S. officials appeared to accept Pakistan's rationale that it has limited military resources and cannot risk getting ahead of the public's acceptance for a campaign that involves killing fellow Muslims.

"We have to do this in a way that is comfortable for them, and at a pace that they can accommodate and is tolerable for them," Gates said ahead of meetings with Pakistani civilian and military leaders. "Frankly, I'm comfortable doing that. I think having them set that pace as to what they think the political situation will bear is almost certainly the right thing to do."

The Obama administration has taken a softer tone with Pakistan in recent months, praising the country's unprecedented assault on militants inside its borders and dropping public appeals for Pakistan to focus on the militants along its western border with Afghanistan.

A Filipino militant wanted by the United States is believed to have been killed in an American drone strike close to the Afghan border earlier this month, Pakistani intelligence officials said Thursday.

If confirmed, the death of Abdul Basit Usman would represent another success for the U.S. covert missile program on targets in Pakistan. There have been an unprecedented number of attacks this month following a deadly Dec. 30 militant attack on a CIA base in Afghanistan.

U.S. officials do not often talk about the missile strikes or their targets, but they have in the past confirmed the deaths of several mid- and high-level al-Qaida and Taliban fighters.

Most of the missiles are fired from unmanned drone aircraft launched from Afghanistan.

Gates was asked about the drone program during an interview with local Express TV.

"I'm not going to discuss operations but I will say this: These unmanned aerial vehicles have been extremely useful to us, both in Iraq and in Afghanistan," he said.

Gates said he is expanding the program by buying more of the aircraft. He also said the United States was considering ways to share intelligence with the Pakistani military, including possibly giving it U.S.-made drones for intelligence and reconnaissance purposes.

U.S. officials said Gates was referring to a proposed deal for 12 unarmed Shadow aircraft. The officials spoke on condition of anonymity to discuss sensitive military cooperation.

In meetings Thursday with Pakistani President Asif Ali Zardari, the country's army chief and others, Gates called the antiterror operations a success so far, "and he acknowledged to all of them that we realize that has come with a great deal of sacrifice for the military," Pentagon press secretary Geoff Morrell said following the sessions.

"We are not trying to prescribe a timeline by which they must do things," Morrell said.

Abbas' comments clearly indicate Pakistan will not be pressured to quickly expand its fight beyond militants waging war against the Pakistani state. Whether it can be convinced in the long term is still an open question.

The Pakistani army launched a major ground offensive against the Pakistani Taliban's main stronghold near the Afghan border in mid-October, triggering a wave of retaliatory violence across the country that has killed more than 600 people.

Washington believes Pakistani pressure on militants staging cross-border attacks against coalition troops in Afghanistan is critical to success in Afghanistan as it sends an additional 30,000 troops to the country this year.

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