Turkish F-16 fighter jets have been scrambled after a Russian warplane violated Turkey's air space on Saturday, the foreign ministry says.

The Russian fighter plane "exited Turkish airspace into Syria" after being intercepted, the ministry said.

The Turkish foreign minister has spoken to his Russian counterpart, as well as ministers from other Nato countries.

Russia has been carrying out air strikes in Syria in support of President Bashar al-Assad.

The Russian embassy in Ankara said a Russian plane did violate Turkish airspace, and Russia has "explained it" to Turkey, Russian news agency Interfax reports.

A Kremlin spokesman in Moscow did not confirm the incident however, saying:

"Our ambassador was called to the foreign ministry and given a note, which mentions certain facts, which will be checked."

The Russian air campaign began on Wednesday with Moscow insisting it was targeting Islamic State (IS) positions. But Syrian activists say Russian planes have also targeted other Syrian groups opposed to President Assad.

On Monday Russia said it had "continued performing pinpoint strikes" on IS targets in Syria, carrying out 25 sorties and hitting nine IS targets.

Among those targets was a communications centre in Homs, and a command centre in Latakia, it said.

Nato said its Secretary-General Jens Stoltenberg would meet the Turkish Foreign Minister Feridun Sinirlioglu at the organisation's headquarters in Brussels later on Monday.