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Ukraine's Foreign Minister Dmytro Kuleba tweeted on his official page that "peaceful Ukrainian cities are under strike" and called the situation "a war of aggression." And an adviser to the Ukrainian Interior Minister, Anton Gerashchenko, told journalists Russia's "invasion has begun" with "missile strikes on Kyiv."

"Now you have Ireland and Great Britain and, you know, the Republic standing together against a murderous dictator, a pure thug, who is waging an immoral war against the people of Ukraine," Biden said.

"Yesterday, President Biden said that in his opinion, war crimes have been committed in Ukraine. Personally, I agree," Blinken said. "Intentionally targeting civilians is a war crime. After all the destruction of the past few weeks, I find it difficult to conclude that the Russians are doing otherwise."

Hill told his sister on Facebook messenger that the Ukrainian people were very patient and when they lined up for food or supplies -- they would only take what they needed.

On social media, he described feeling helpless, hungry and freezing as he narrated an increasingly dangerous war.

On March 8, his post began: "Intense bombing last night for 2 hours. It was close to hospital. Machine gun fire could be heard. It stopped just after midnight."

On Monday, he wrote, "we are hanging in there...very coold (sic) inside. food portions are reduced..bombing and explosions most of the night..hard to sleep. People getting depressed."

The Associated Press has learned that a pregnant woman and her baby died after Russia bombed the maternity ward where she was meant to give birth last week. AP journalists, reporting from inside the city of Mariupol, saw the attack first-hand.