"Syria strongly condemns the illegal visit of the chairman of the US Joint Chiefs of Staff to an illegal US military base in northeastern Syria," the ministry said, calling it a flagrant violation of Syria's sovereignty and territorial integrity.
Multiple US media have reported about the unannounced trip that took place on Saturday. Gen. Milley is said to have visited a logistics base in a Kurdish-held area to talk with troops and prepare recommendations for the Pentagon. The mission was allegedly in support of the US operation to defeat the Islamic State terror group (banned in Russia).