Ukrainian troops battle Russians street-to-street in eastern region; see pics

Ukrainian service members prepare shells for a M777 Howitzer near a frontline, as Russia's attack on Ukraine continues, in Donetsk Region, Ukraine.

An Ukrainian service member holds a next generation light anti-tank weapon (NLAW) at a position on the front line, amid Russia's attack on Ukraine, near Bakhmut, in Donbas region, Ukraine.

A Ukrainian service member is pictured near an automatic grenade launcher at a position on the front line, amid Russia's attack on Ukraine, near Bakhmut, Donbas region, Ukraine.

A Ukrainian service member smokes in a trench at a position on the front line, amid Russia's attack on Ukraine, near Bakhmut, Donbas region, Ukraine.

A Ukrainian service member is pictured near an automatic grenade launcher at a position on the front line, amid Russia's attack on Ukraine, near Bakhmut, Donbas region Ukraine.

Fire burns inside the heavily damaged city civil-military administration building, after Russian army artillery strikes in Lysychansk, Ukraine.

View of the heavily damaged centre for student and youth extracurricular activities, after Russian army artillery strikes in Lysychansk, Ukraine.

A firefighter extinguishes a fire at a warehouse following recent shelling during Ukraine-Russia conflict in Donetsk, Ukraine.

A shell crater is seen near buildings destroyed by Russian military strike, amid Russia's invasion on Ukraine, in the town of Druzhkivka, in Donetsk region, Ukraine.

A local resident Elena, 81, reacts as she leaves her building destroyed by Russian military strike, amid Russia's invasion on Ukraine, in the town of Druzhkivka, in Donetsk region, Ukraine.