Syria's deputy foreign minister says the country's air force will shoot down any Turkish fighter jets that attack Syria.
The warning comes as tensions are skyrocketing over apparent Turkish preparations to attack a Kurdish enclave in the north of the country.
Faysal Mekdad says Syria considers any air attack or ground operations by Turkey on the Kurdish enclave of Afrin to be a "aggressive act" and a violation of international law.
He read a statement to reporters on Thursday.
Turkish President Recep Tayyip Erdogan said this week that Turkey would start operations against the enclave of Afrin within days. Turkey says the Kurdish group in control of Afrin is a terror organization that is an extension of a separatist movement inside Turkey.