WASHINGTON (AP) — The Obama administration is moving ahead with plans for negotiating with the Taliban, confident that talks offer the best chance to end the 10-year-old war in Afghanistan. But the military worries things are moving too fast, and intelligence agencies offered a gloomy prognosis in their latest Afghanistan report.

Several current and former U.S. officials said the most substantive give-and-take to date between U.S. and Taliban negotiators could happen in the next week, with the goal of establishing what the U.S. calls confidence-building measures — specific steps that the U.S. and the insurgents agree to take ahead of formal talks. Those talks, if they ever take place, would include the United States, the Taliban and the Afghan government of President Hamid Karzai, a senior U.S. official said.

Like others interviewed, the official spoke on condition of anonymity to describe sensitive diplomacy. Elements of the U.S. outreach to the Taliban are also classified.

The diplomatic, military and intelligence branches of the U.S. government differ over the value of talks with the Taliban or whether now is the right time to so publicly shift focus away from the ongoing military campaign that primarily targets Taliban insurgents. Defense Secretary Leon Panetta and some uniformed military leaders have recently sounded some of the strongest notes of caution, especially on when to grant Taliban requests for the transfer of several of its prisoners from the U.S. military prison at Guantanamo Bay, Cuba, military and other U.S. officials said.

The latest Afghan National Intelligence Estimate warns that the Taliban will grow stronger, using the talks to gain credibility and run out the clock until U.S. troops depart Afghanistan, while continuing to fight for more territory, say U.S. officials who have read the classified document. They spoke on condition of anonymity to describe the roughly 100-page review, an amalgam of intelligence community’s predictions of possible scenarios for the Afghan war through the planned end to U.S. combat in 2014.

It says the Afghan government has largely failed to prove itself to its people and will likely continue to weaken and find influence only in the cities. It predicts that the Taliban and warlords will largely control the countryside.

Meanwhile, Karzai is still uneasy with the pace and direction of talks. He resents the selection of Qatar as the site of a Taliban political office, although he has reluctantly agreed to that U.S.-backed plan. And he worries that the United States will strike a deal with the Taliban and force that deal on his government, two Afghan officials told The Associated Press, speaking on condition of anonymity to describe sensitive discussions. Karzai wanted the office located in Saudi Arabia, Turkey or Afghanistan.

U.S. officials close to the negotiations say that despite these warnings the Taliban high command is more ready for talks than in the past, at least with the United States if not the elected Afghan government it opposes.

One sign was the surprising public endorsement by the Taliban of the plan to open a negotiating office in the Persian Gulf state of Qatar. But U.S. officials also cite more subtle indications of a shift toward peace negotiations, including the recent participation in preliminary talks of more senior and influential Taliban representatives.

The senior U.S. official said negotiators are now confident they are talking to credible intermediaries for the main Taliban command based in Pakistan.

The administration’s top negotiator, Marc Grossman, was building support for talks among regional allies such as Turkey and Saudi Arabia this week, to be followed by discussions with Taliban representatives, U.S. and other government officials said. Ahead of those sessions, officials described them as the most substantive and highest-level to date, with plans to cover specifics of the new office and the sequence of further good faith efforts on both sides that would set the stage for real talks.

One topic was expected to be a U.S. offer to release two or three Taliban prisoners from Guantanamo to custody in Qatar, although two officials said that effort is moving more slowly than plans for the office. A waiting period would follow that transfer before any other Taliban transfers would be considered. U.S. officials said Congress would be consulted throughout.

The Taliban had sought both the office and the prisoner release as preconditions for real talks.

The senior U.S. official said the U.S. has set clear conditions for opening the office, including that the Taliban must agree not to use it for fundraising or propaganda, or to run insurgent operations. Larger conditions include assurances that the insurgents are truly interested in a political settlement and not using negotiations as a way to run out the clock until U.S. forces leave.

The central political office confers instant, though controversial, legitimacy on the diffuse insurgency as a political movement and provides a site for formal talks. The idea is to give the Taliban room to negotiate in a location with less direct pressure from Pakistan, which has ties to some militant groups and houses parts of the Taliban leadership.

The U.S. intelligence assessment looks past the near horizon for talks.

It predicts the likely outcome of two strategies: moderate engagement, in which the U.S. continues special operations raids against key Taliban leaders, and village outreach to strengthen local government, while conventional forces train Afghanistan’s army and police force, and limited engagement, in which the U.S. would continue economic and political support, and some Afghan security training, but most troops would withdraw.

Both strategies can weaken the Taliban, the analysts say, but ultimately, neither course of action is likely to stop the continued weakening of the Afghan state, the officials said. The NIE did suggest eliminating top Taliban leaders in the next two years and continuing to build Afghan government could help offset that.

In that way, the NIE’s bleak predictions also give the White House reason to hasten the reconciliation process, in order to pull U.S. troops out what some analysts termed a hopeless stalemate.

Arsala Rahmani a former Taliban official turned Afghan peace negotiator, said that in the past year the Taliban leadership had expressed to the United States a new willingness to negotiate.

“Something happened,” said Rahmani, a member of the Afghanistan peace council. “The leadership of the Taliban saw a green light from the Obama administration and after that, the Taliban leadership appointed people to get involved in the negotiation process.”

Although U.S. and Taliban representatives have met secretly several times over the past year in Europe and the Persian Gulf, the Taliban endorsement of the office plan on Jan. 3 was the first time it has publicly expressed willingness for substantive negotiations.

U.S. and other officials also said they are encouraged by the insurgents’ apparent plans to staff the new headquarters office with senior figures with ties to top Taliban leader Mullah Mohammad Omar.

The U.S. considers full peace negotiations on the model of Northern Ireland or the former Yugoslavia to be a long shot now, several officials said. But the administration is trying to build a framework for political discussions between the Taliban and the Karzai government that could span the next two years when U.S. combat forces will withdraw.

The Taliban sought direct talks with the U.S., whom it considers the true power broker in Afghanistan, as an alternative to talks with the Karzai government. The United States had shunned such contacts for years, saying talks must be led by Afghans and that military gains must be consolidated before talks would be productive.

The Obama administration shifted course last year and opened the direct channel in secret. The U.S. acknowledged the previously clandestine contacts only after they were revealed publicly, apparently by allies of Karzai who felt undermined by the separate channel.

There were multiple avenues of communication between the U.S. and the Taliban over the last year, some public and others through back channels. The senior U.S. official said none was judged to be an authentic direct message from Omar.

The United States considers Omar a terrorist who could be killed by U.S. forces in the same manner as Osama bin Laden. But the U.S. also recognizes that Omar is the linchpin to a deal that could finally end the war that began with the 2001 U.S. invasion and ouster of the ruling Taliban government. The Taliban has sought a return to political and territorial influence ever since, primarily through guerrilla tactics.

U.S. and Afghan officials think Omar is interested.

A personal emissary of Omar, Tayyab Agha, conducted the initial, tentative contacts with the U.S. last year and remains a lead negotiator.

Rahmani said other Taliban negotiators include Shahabuddin Dilawar, former Taliban ambassador to Saudi Arabia; and Mohammed Sher Abbas Stanikzai., former deputy health minister during the Taliban regime. Without approval from Omar, these people would not have been appointed, he said.

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Associated Press writers Deb Riechmann contributed to this report from Kabul and Kathy Gannon contributed from Islamabad.

AP National Security Writer Anne Gearan can be followed on Twitter (at)agearan, and AP Intelligence Writer Dozier can be followed (at)kimberlydozier.