US and Taliban negotiating teams arrived at a ceremony in Doha on Saturday to sign a deal that will see America begin to withdraw its troops in return for insurgent guarantees.

US Secretary of State Mike Pompeo, who will oversee the signing, was greeted by Qatari officials, along with Washington's chief negotiator Zalmay Khalilzad.

Taliban co-founder Mullah Baradar led the insurgents' delegation.