The pact allows the US and its allies to keep 10,000 to 15,000 troops in Afghanistan after most US and NATO combat troops leave by the end of 2014.
The residual forces will remain until 2024 to train and assist Afghan forces as well as conduct counterterrorism missions. In addition, the deal gives the US jurisdiction for the prosecution of US troops in Afghanistan.
"Afghans are rightly taking the lead in providing for their own peace and security," Kerry said in his statement.
"We remain committed to supporting those efforts, and look forward to signing an agreement that will enable us to do so," he added.
