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The United States and Afghanistan on Tuesday signed a long-delayed security agreement that will allow about 9,800 American troops to remain in the country past this year.

"This agreement is only for Afghan security and stability," Afghan President Ashraf Ghani Ahmadzai said. The agreement was signed a day after Ahmadzai was signed into office.

The agreement ensures a long term presence of US and coalition troops in Afghanistan and sets the two countries on a more stable relationship.

US and Afghan officials had agreed on terms of the accord more than a year ago, but former Afghanistan President Hamid Karzai had refused to sign. Karzai had an often rocky relationship with Washington.

Karzai had complained about US airstrikes that have killed Afghan civilians and US overtures to the Taliban, the Islamists who had ruled Afghanistan until ousted by American forces in 2001. The Taliban has been waging a civil war ever since.

Both Ahmadzai and his rival, Abdullah Abdullah, had said they would sign the agreement if elected.

"We are eager to work with President Ghani and Chief Executive Officer Abdullah, and a new Afghan government, to achieve more success in the coming years," said James Cunningham, the US ambassador to Afghanistan.

The two formed a power-sharing government, with Abdullah named chief executive, a position with substantial influence within the government.

"We have a perfect opportunity to reset this relationship now that there is more pragmatic leadership," said Marc Chretien, a former top political adviser to the coalition command in Kabul, referring to relations between Afghanistan and the West.

The residual US force will be responsible for advising and supporting Afghan security forces and conducting counterterrorism missions against al-Qaeda and its affiliates. The American combat mission in Afghanistan ends this year.

Afghan security forces are already leading operations throughout the country as US forces have largely withdrawn from direct combat.

NATO countries are expected to contribute troops to the residual force as well, bringing the total to about 12,000.

Under the plan the number of US forces would be reduced by more than half in 2015 and then removed entirely by 2017.

There are about 24,000 US troops in Afghanistan, down from a peak of about 100,000 in 2010 and 2011, according to the Pentagon.