"There will be no unilateral troop reduction, it will be coordinated," he told reporters following a meeting of NATO defence ministers. "We came out of here much stronger and coordinated."
In late January, Afghan President Ashraf Ghani vowed to try to remove all foreign troops from the country. In addition, an agreement on the possible withdrawal of the US forces from Afghanistan was reportedly reached during recent talks between the United States and Taliban in Qatar.
The movement, for its part, pledged to prevent terrorist groups such as al-Qaeda from using Afghanistan as a base to carry out operations in other countries under the future deal.
On INF Treaty
The North Atlantic Treaty Organization (NATO) is united in supporting the United States' withdrawal from the Intermediate-range Nuclear Forces, acting US Defense Secretary Patrick Shanahan said on Thursday.
"NATO maintained unity on a sensitive, critically important issue," Shanahan said in Brussels after a meeting of ministers from the North Atlantic Treaty Alliance (NATO).
The acting Pentagon chief also said the public in Western countries is not aware "of the evolving threat" from Russia and China.
"I'm referring to the evolving situation we see with our infrastructure, cybersecurity, space," he said, adding that NATO ministers had discussed the issue during their meeting.
Shanahan also stressed that US commitment to its NATO obligations remains "ironclad," including its obligations under the North Atlantic Treaty's Article 5, which enshrines the principle of collective defense. He dismissed any concerns that President Donald Trump might not be committed to the alliance.
*al-Qaeda is a terrorist group banned in Russia