A woman reacts as paramedics perform CPR on a girl who was injured during shelling Sunday at city hospital of Mariupol, eastern Ukraine. The girl did not survive.

Members of civil defense prepare Molotov cocktails in a yard in Kyiv, Ukraine on Sunday. A Ukrainian official says street fighting has broken out in Ukraine's second-largest city of Kharkiv.

An armored vehicle rolls outside Mykolaivka, Donetsk region, the territory controlled by pro-Russian militants, in eastern Ukraine, Sunday. Fighting also raged in two eastern territories controlled by pro-Russia separatists.

A refugee boy who fled conflict from neighboring Ukraine cries at the railway station after arriving in Zahony, Hungary, on Sunday.

An armored personnel carrier burns and damaged light utility vehicles stand abandoned after fighting Sunday in Kharkiv, Ukraine.

Armed civil defense men pose for a photo while patroling an empty street due to curfew Sunday in Kyiv, Ukraine. Ukrainian authorities say that Russian troops have entered Ukraine's second-largest city of Kharkiv. Russian troops also put increasing pressure on strategic ports in the country's south following a wave of attacks on airfields and fuel facilities elsewhere that appeared to mark a new phase of Russia's invasion.

Women take part in a protest against the Russian invasion of Ukraine, in front of the Russian embassy in Vilnius, Lithuania, on Sunday.

A Polish woman hugs a Polish volunteer named Jedrzej 34, waiting to cross the border to go and fight against Russian forces .

Police detain a demonstrator during an action against Russia's attack on Ukraine in St. Petersburg, Russia, on Sunday. Protests against the Russian invasion of Ukraine resumed on Sunday, with people taking to the streets of Moscow and St. Petersburg and other Russian towns for the third straight day despite mass arrests.

Demonstrators display placards as they march during a rally in support of Ukraine on Sunday in Boston.

A Ukrainian soldier walks past debris of a burning military truck, on a street in Kyiv.

Protesters hold a placard reading "Stop Putin" during a demonstration against Russia's attack on Ukraine in Munich.