Russia has warned Ukraine that it may take measures to protect Russian ships crossing the Sea of Azov should Kyiv stop or seize any.
Russia's War Against Ukraine
RFE/RL: Kremlin warns may act to protect Russians if Ukraine seizes ships in Sea of Azov
Ukrainian frontier soldiers are pictured aboard a patrol boat at the commercial port of Mariupol on the Sea of Azov on August 14, 2018.