The U.S. Navy has introduced new measures aimed at avoiding a repeat of two deadly crashes in the Asia Pacific region involving its warships and commercial vessels following a review of its practices, the Seventh Fleet commander said on Monday.

Vice Admiral Phillip Sawyer's comments come after a U.S. guided-missile destroyer was slightly damaged at the weekend when a Japanese tug drifted into it during a towing exercise off central Japan, the latest incident in the Pacific this year involving ships from the fleet.

The U.S. Navy announced a series of reforms this month aimed at restoring basic naval skills and alertness at sea after a review of deadly collisions in the Asia-Pacific region showed sailors were undertrained and overworked.