Turkey should withdraw its troops from Afghanistan under the 2020 deal for the pullout of U.S. forces, a Taliban spokesman said on Thursday, effectively rejecting Ankara's proposal to guard and run Kabul's airport after U.S.-led NATO forces depart.

The development raises serious questions for the United States, other countries and international organizations with missions in Kabul about how to securely evacuate their personnel from landlocked Afghanistan.

It also appeared to dash Ankara's hopes of using the securing of Kabul airport to help improve ties with Washington - strained by Turkey's purchase of Russian defense systems - in talks set for Monday between U.S. President Joe Biden and Turkish President Tayyip Erdogan.

Asked in a text message whether the Taliban rejected Turkey's proposal to keep forces in Kabul to guard and run the international airport after other foreign troops leave, the Taliban spokesman in Doha responded that they should go as well.

"Turkey was part of NATO forces in the past 20 years, so as such, they should withdraw from Afghanistan on the basis of the agreement we signed with the U.S. on February 29, 2020," said Suhail Shaheen.

Under the February 2020 deal secured with the Taliban under former President Donald Trump, all U.S. forces were to be out of Afghanistan by May 1.

But Biden said in April that the pullout would be completed by the 20th anniversary of the September 11, 2001, the day Al-Qaeda terrorists attacked the United States.

Turkish officials said they made the Kabul airport proposal at a NATO meeting in May when the United States and its partners agreed to a plan to withdraw their forces by September 11 after 20 years of backing the Afghan government in a war against the Taliban.

The Pentagon said the U.S. withdrawal is more than 50 percent complete. Turkey, with more than 500 soldiers still in Afghanistan training security forces, now has the largest foreign military contingent there.

Australia closed its embassy last month because of security concerns. The Taliban's rejection of the Turkish plan to secure the airport could prompt other countries to shutter their missions.

The development also poses a quandary for the Biden administration, with Secretary of State Antony Blinken vowing this week at a congressional hearing to maintain a U.S. diplomatic presence in Kabul.