Russian fighter jets were captured on video harassing US military drones above Syria.
The US Air Force said the MQ-9 Reaper drones were conducting a mission against ISIS Wednesday.
US officials have warned that Russian aircraft are increasingly carrying out aggressive actions.
An unclassified video published by the Air Force shows some moments of the engagement.
"These events represent another example of unprofessional and unsafe actions by Russian air forces operating in Syria, which threaten the safety of both US and Russian forces," Grynkewich said.
Persons:
—, Alexus Grynkewich, Grynkewich, Michael Kurilla, Russian Su
Organizations:
US Air Force, ISIS Wednesday, Service, Russian, Islamic State, US Air Forces Central Command, Air Force, ISIS, Central Command, Raptors, Moscow, Islamic
Locations:
Syria, Russian, Islamic State, Washington