Story highlights The U.S. considers this a very unsafe aerial maneuver and is expected to voice its concerns to the Russians

This is the second barrel roll maneuver over a U.S. aircraft by the Russians this month

Washington (CNN) A Russian SU-27 conducted a "barrel roll" Friday over the top of a U.S. Air Force RC-135 which was flying a reconnaissance mission in international airspace above the Baltic Sea, the Defense Department said.

The Russian SU-27 approached alongside within 25 feet of the U.S. aircraft and then flew inverted over the top of the plane to the other side, Lt. Col. Michelle L. Baldanza, a U.S. Army spokesperson, said in a statement.

"The SU-27 intercepted the U.S. aircraft flying a routine route at high rate of speed from the side then proceeded to perform an aggressive maneuver that posed a threat to the safety of the U.S. aircrew in the RC-135," Baldanza said.

The U.S. considers this a very unsafe aerial maneuver and is expected to voice its concerns to the Russians, a U.S. defense official told CNN.

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