Anton Herashchenko

Air strikes rocked Ukraine's strategic Black Sea port Odessa early Sunday morning, according to an interior ministry official, after Kyiv had warned that Russia was trying to consolidate its troops in the south.

"Odessa was attacked from the air," Anton Herashchenko, adviser to the interior minister, wrote on his Telegram account.

More than 500,000 refugees have already fled Ukraine due to the Russian military attack. This is the information from the UN High Commissioner for Refugees.

In Poland alone, 280,000 foreigners entered the conflict. Nearly 85,000 entered Hungary, 36,000 in Moldova, and more than 30,000 in Romania and Slovakia. 300 people entered Belarus from Ukraine.

Russian troops have entered Kharkiv, said Anton Herashchenko, an adviser to Ukraine's interior minister, Reuters reported.

Russian military vehicles are passing through the streets of the northeastern Ukrainian city, Gerashchenko wrote in Telegram.