KHARKIV, Ukraine—Ukraine on Monday said it sank two Russian naval vessels in the Black Sea with drone strikes, as explosions rang out once again in Russia’s border region of Belgorod and heavy fighting continued in eastern Ukraine.

Ukraine released video footage of what it said were Bayraktar TB-2 armed drones hitting the two Raptor-class patrol boats at 4:51 a.m. local time Monday near Snake Island, a Ukrainian island that Russian forces captured on the first day of the war on Feb. 24. Both boats appeared to be hit, but it wasn’t clear whether they sank. Russia didn’t comment on the Ukrainian claim.

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