President Vladimir Putin has sent condolences after a Russian air strike accidentally killed three Turkish soldiers in northern Syria.
The strike hit a building near the town of al-Bab, believing it to contain Islamic State (IS) fighters rather than Turkish troops, Turkey's military said.
Eleven others were wounded in the so-called friendly fire incident.
They were supporting Syrian rebels who are locked in a fierce battle to try to capture al-Bab from IS fighters.
Russia and Turkey, who back opposing sides in the Syrian war, have been jointly conducting air strikes on IS in the town in recent weeks. Read More.....
