Russian troops continue to battle Ukrainian defense forces and citizen soldiers for control of Kyiv, the capital, and other cities Sunday, the fourth day of Russia’s invasion of Ukraine.
In Photos: Russian Invasion of Ukraine, Feb. 27, 2022

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People take shelter inside a building in Mariupol, Ukraine, Feb. 27, 2022. Street fighting broke out in Ukraine's second-largest city and Russian troops squeezed strategic ports in the country's south as the prospect of peace talks remains uncertain.

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Additional Russian ground forces approach Nova Kakhovka, Ukraine, Feb. 26, 2022.

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A view shows a burning oil depot reportedly hit by Russian shelling near the military airbase Vasylkiv in the Kyiv region, Ukraine, Feb. 27, 2022.

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Refugees from Ukraine arrive to the railway station in Przemysl, Poland, Feb. 27, 2022.