according to preliminary data, one of the Su-24 pilots has died after being fired at from the ground.
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According to the Geneva Convention attacks on persons parachuting from an aircraft in distress are strictly banned: if the person in distress is not acting in a hostile manner, he is to be given the chance to surrender after reaching the ground.
Russian President Vladimir Putin told reporters in Moscow on Thursday that the strike was unexpected.
"It did not even come into our mind that we could be struck by a party that we considered to be our ally," he said. "We considered Turkey to be a friendly country."