The southwestern region of Volgograd came under particularly heavy fire, with 67 Ukrainian drones reportedly downed by Russian air defenses.

War may be the only thing keeping Russia's economy afloat. According to Jay Zagorsky, an economist and markets professor at Boston University's Questrom School of Business, the Ukraine invasion is likely the only thing preventing the country from slipping into a recession.

I'm not on Russia's side — but unfortunately the reality of it is that the way the war in Ukraine is going to end is with a negotiated settlement,” he said.