The fighting between Ukrainian and Russian forces continues in the Donbas region of eastern Ukraine.
"There were battles with Russian troops on every street," said Serhi Haidai, the governor of Ukraine's Luhansk.
The Russian army is strengthening the offensive by sending an additional 20 tactical corps, especially in the eastern region.
Usually, one tactical corps has 600-800 people, and it is estimated that 20 tactical corps have a maximum of 16,000 people.