The military exercise, for which it is unknown how long it will last, will take place while relations between Ukraine and Russia are very tense.
Ukraine recently accused Russia of deploying thousands of military personnel at Ukraine’s northern and eastern borders.
Ukraine has been fighting pro-Russian separatists in breakaway regions of Donetsk and Lugansk in the east of the country since 2014, the same year that Russia annexed the Crimean peninsula.
The Russian Defense Ministry said on Friday that some parts of the Crimean sea area will be closed for months due to exercises.
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