BRUSSELS, Belgium — The Bush administration plans to ask Congress for $10.6 billion for Afghanistan, a major increase aimed at rebuilding the country and strengthening government security forces still fighting the Taliban five years after the U.S.-led invasion.

Secretary of State Condoleezza Rice said all but $2 billion of the money is for security needs. She detailed the plan as she prepared to attend a NATO gathering meant to plan for an expected Taliban military offensive in the spring.

Among other issues Rice was to raise today with her NATO colleagues were the divisions within the alliance on sharing the burden in Afghanistan. Some NATO countries have shown a greater willingness than others to send troops to areas of conflict.

The United States is by far the largest contributor to the 34,460-member NATO force in Afghanistan, with 11,800 troops. Britain is next with 5,200.

"We're looking to others to step up their effort with us, step up across the board," Richard Boucher, Assistant Secretary of State for South and Central Asia, told reporters Thursday.

The Bush administration funding proposal follows a year in which Taliban forces launched surprisingly fierce attacks across the country, poppy production expanded and relations worsened between Afghanistan and Pakistan, a key ally in the fight against global terrorism.

"The challenges of the last several months have demonstrated that we want to and we should redouble our efforts," Rice told reporters flying with her to Brussels for the NATO sessions.

The U.S. aid package would fund training and equipment to meet a previously set goal of increasing the ranks of Afghan soldiers and national police to about 70,000 and 82,000 respectively, among other uses, a State Department official said. The official spoke on condition of anonymity because President Bush will make a formal budget request next month.

The United States wants to strengthen the democratic government of Afghan President Hamid Karzai, who has struggled to extend political control throughout his country and quarreled with Pakistani President General Pervez Musharraf.

The new U.S. money would be on top of $14.2 billion in aid the United States has already given to Afghanistan since the 2001 U.S.-led invasion that toppled the Taliban government.

Rice said that of the total, $8.6 billion would be for training and equipping Afghan police and security forces, and $2 billion would be for reconstruction. The money would be spent over the next two years.

The aid proposal comes alongside a move toward increasing the number of U.S. forces in Afghanistan.

The Defense Department has said that 3,200 soldiers from the New York-based 10th Mountain Division already in Afghanistan would have their tour extended by four months. In a visit to Afghanistan last week, new Defense Secretary Robert Gates indicated he is likely to ask Bush for more troops for the country.