Syria denounced Turkey's downing of a Russian jet over its territory Tuesday as a "flagrant aggression against Syrian sovereignty" and a show of support for "terrorists", state media reported, according to AFP.

"In a flagrant aggression against Syrian sovereignty, the Turkish side this morning brought down a friendly Russian plan on Syrian territory on its  return from a combat mission against Daesh," state news agency SANA cited a military source as saying, using the Arabic acronym for the "Islamic State" (ISIS).

The incident "demonstrates without a doubt that the Turkish government takes the side of terrorism and gives its support to terrorist groups that have began to collapse under the blows of the Syrian army," the source added.