The Chinese air force has ramped up its combat rhetoric in its latest propaganda video, with pilots warning enemies in English and top brass stressing the need for crisis mode.
The four-minute video was posted on the Ministry of National Defence's website on Wednesday and begins with two J-20 stealth fighters taking off from an unidentified airbase.
At least three missile-carrying J-11 jets are then shown make low passes and various aerobatics at sea.
After that, a pilot shouts in English: "This is the PLA Air Force speaking. You are about to enter Chinese airspace. Leave immediately. Leave immediately."
The video also features members of an elite brigade called the "Eagles of Liaoning province", a frequent winner of PLA Air Force competitions.