Fierce fighting in battle for Ukraine's east amid Russian invasion | Pics
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Street fighting between Ukrainian and Russian troops raged in the battle for the industrial city of Sievierodonetsk
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Moscow's forces pushed to conquer Ukraine's eastern Donbas, seeking a decisive win more than 100 days into the invasion.
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The city has become the main target of the Russian offensive in the Donbas - comprising Luhansk and Donetsk provinces - as the Kremlin's invasion grinds on in a war of attrition that has seen cities laid waste by artillery barrages.
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Two civilians were killed in Russian shelling in the Donetsk and Luhansk regions on Monday.
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After being pushed back from Kyiv and Kharkiv in the war's early stages, Russia says it is on a mission to "liberate" the Donbas.