Russia’s military is making “incremental progress” in its efforts to capture the Donbas region of Ukraine, a senior U.S. defense official said.

Russia and Ukraine’s military are mainly fighting in the Donbas region, which is in the eastern part of Ukraine that borders Russia and where Ukrainians and pro-Russian separatists have engaged in fighting for years. After the Russians failed to conquer the capital of Kyiv, they redirected their attention to the Donbas.

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