Russia launched a massive attack on Ukraine's Kharkiv, killing four and injuring dozens. President Zelenskyy condemned the violence and appealed for urgent air defense assistance.

The United States believes that Russian President Vladimir Putin’s threatened retaliation against Ukraine over its drone attack last weekend has not happened yet in earnest and is likely to be a significant, multipronged strike, according to US officials.

Russian ballistic missiles have been launched toward Ukraine from multiple directions, the Ukrainian Air Force said on Telegram Friday.