One Su - 24 left its formation and began to fly closer to the Donald Cook .
On 12 April 2014 , the Donald Cook was operating in the western Black Sea when a pair of unarmed Russian Su - 24 Fencer attack aircraft enter the area .
One Su - 24 Fencer     left Su - 24 Fencer 's formation and began to fly closer to the Donald Cook .
On 12 April 2014 , the Donald Cook was operating in the western Black Sea when a pair of unarmed Russian Su - 24 Fencer attack aircraft enter the area .