Russian military aircraft have conducted a series of "aggressive" overflights of a US destroyer in international waters in the Baltic Sea, a US defense official said Wednesday.

Russian military aircraft have conducted a series of "aggressive" overflights of a US destroyer in international waters in the Baltic Sea, a US defense official said Wednesday.

Speaking on condition of anonymity, the official described several incidents on Monday and Tuesday, including one in which a Russian Su-24 jet flew just 30 feet (nine meters) above the USS Donald Cook in a "simulated attack profile."

"This is more aggressive than anything we've seen in some time," the official said. The destroyer was in the Baltic Sea in international waters, about 70 nautical miles from Kaliningrad.