Turkey’s foreign minister suggested Wednesday that the United States could be barred from using two strategic air bases in retaliation to possible U.S. sanctions against his country, the state-run Anadolu Agency reported.

Russia, Turkey and Iran are concerned about the increased presence of terrorist groups in Syria’s Idlib province, the three countries said after talks in Kazakhstan, pledging to coordinate actions aimed at eliminating the militants.

American commanders have requested guidance on dealing with an attack from those armed groups and others from Iran and the Syrian government, but officials say they have received muddled direction.