The biggest ever "Sea Breeze" exercises come days after Russia said its navy had fired warning shots against a British warship to chase it out of Black Sea waters.
A total of 32 countries began conducting military exercises in the Black Sea Monday, despite sharp criticism from Russia.
The U.S. and Ukraine are leading the "Sea Breeze" drills. They are scheduled to last for two weeks, according to the U.S. military.
Over 5,000 troops, 32 ships and 40 aircraft, as well as 18 special operations and dive teams, are involved this year. They are said to focus on areas like amphibious warfare, diving operations, air defense and anti-submarine warfare, among other things, DW reported.