Turkish fighter jets shot down a Russian warplane near the Syrian border Tuesday after repeated warnings over air space violations, but Moscow said it could prove the jet had not left Syrian air space.
It was the first time a NATO member's armed forces have downed a Russian or Soviet military aircraft since the 1950s and Russian and Turkish assets fell on fears of an escalation between the former Cold War enemies.
A Kremlin spokesman said it was a "very serious incident," but that it was too early to draw conclusions.