More Ukrainians flee besieged areas; see pics

Volunteers help a wounded man to board a train to Dnipro and Lviv during an evacuation effort from war-affected areas of eastern Ukraine, amid Russia's invasion of the country, in Pokrovsk, Donetsk region, Ukraine.

A woman with a child boards a train to Dnipro and Lviv during an evacuation effort from war-affected areas of eastern Ukraine, amid Russia's invasion of the country, in Pokrovsk, Donetsk region, Ukraine.

An elderly woman waits to board a train to Dnipro and Lviv during an evacuation effort from war-affected areas of eastern Ukraine, amid Russia's invasion of the country, in Pokrovsk, Donetsk region, Ukraine.

A man pets a dog before boarding a van for an evacuation from the town of Lysychansk, as Russia's attack on Ukraine continues, in Luhansk region, Ukraine.

Police officers check an area as they accompany a woman during an evacuation of local residents between shelling, amid Russia's attack on Ukraine, in the town of Marinka, in Donetsk region, Ukraine.

Local resident walk to a van for an evacuation, as Russia's attack on Ukraine continues, in Lysychansk, Luhansk region, Ukraine.

People wait to board a train to Dnipro and Lviv during an evacuation effort from war-affected areas of eastern Ukraine, amid Russia's invasion of the country, in Pokrovsk, Donetsk region, Ukraine.

People wait to board a train to Dnipro and Lviv during an evacuation effort from war-affected areas of eastern Ukraine, amid Russia's invasion of the country, in Pokrovsk, Donetsk region, Ukraine.

People board a train to Dnipro and Lviv during an evacuation effort from war-affected areas of eastern Ukraine, amid Russia's invasion of the country, in Pokrovsk, Donetsk region, Ukraine.

People board a train to Dnipro and Lviv during an evacuation effort from war-affected areas of eastern Ukraine, amid Russia's invasion of the country, in Pokrovsk, Donetsk region, Ukraine.