Turkey's president has said he is "saddened" by the downing of a Russian combat jet by Turkish forces on the Syrian border last Tuesday.
Recep Tayyip Erdogan said he wished the incident had not happened and hoped it would not happen again.
He has so far refused to apologise to Russia, accusing Moscow of "playing with fire" in its Syria operations.
The president's remarks came as Turkey warned its citizens against non-essential travel to Russia.