The U.S. military Saturday accused a Russian warship of “high risk” and “highly unprofessional” maneuvers near a U.S. Navy ship in the eastern Mediterranean Sea, the second time in as many weeks that American and Russian ships had such a close encounter on the high seas.

A statement from the U.S. European Command (EUCOM) claimed that the frigate Yaroslav Mudry passed unnecessarily near the guided missile cruiser USS San Jacinto. The statement added that the Yaroslav Mudry navigated in the San Jacinto’s wake.

EUCOM said the U.S. cruiser was not threatened and maintained its course and speed. However, the statement said the Russian maneuver was “contrary to international maritime regulations.”

“These actions can unnecessarily escalate tensions between countries, and could result in dangerous miscalculations or accidents,” the EUCOM statement said.