The relations between Russia and Turkey deteriorated after the Su-24 bomber incident in 2015.
On June 27, Turkish President Recep Tayyip Erdogan sent a letter of condolences to Putin over the death of Russian Su-24 pilot and expressed regret over the incident.
Earlier, Turkish Prime Minister Binali Yildirim, commenting on the improvement of relations between Turkey and Russia, thanked Azerbaijan for its contribution to normalization of the relations.
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