As previously reported, the incidents occurred thrice on April 10 and 12. The planes were not carrying missiles. They flew over the destroyer in a combat maneuver. According to The Wall Street Journal, one of the episodes took place when a Polish helicopter was about to take off the Donald Cook. This caused the heli to postpone the flight. According to AFP, one of the planes' maneuvers was performed only nine meters above the destroyer.
Washington sees the maneuvers as unsafe and potentially provocative.
On April 29, the U.S. expressed its protest to Russia over the fact that a Russian Su-27 carried out a roll 30 meters away from an American plane in the skies over the Baltic Sea.