Washington is "prepared to react" if Tehran launches an attack to mark the anniversary of the killing of Qasem Soleimani, the head of US forces in the Middle East warned.
At least eight people were killed in a bombing in the Afghan capital on Sunday, authorities confirmed.
There were no casualties in the rocket attack on the US base.
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Qatari ruler Sheikh Tamim Bin Hamad Al Thani stood and applauded the workers as they passed him.
Mark Milley "discussed the need for an immediate reduction of violence", his spokesperson said, in talks which marked his second ever with the Taliban.
The GCC will meet at the beginning of January in Saudi Arabia, Kuwait has announced.
The 2030 Asian Games will be held in the Qatari capital.
Mullah Abdul Ghani Baradar and his delegation were summoned to Islamabad from Qatar, where they have been negotiating since September.
Five million more Afghans will need assistance in the coming year, the United Nations said on Tuesday.