Ukrainian President Volodymyr Zelensky said Sunday that “millions will be killed” in his country’s war with Russia without additional funding from the United States.

CNN’s Kaitlan Collins asked Zelensky in an interview to respond to comments made by Sen. JD Vance (R-Ohio), who claimed Ukraine’s outcome in its war will not be changed even if it receives the President Biden’s $60 billion aid request. Zelensky said he wasn’t sure if Vance “understands what is going on here.”

“To understand it is to come to the front line to see what’s going on, to speak with the people, then to go to civilians to understand … what will [happen to] them without this support. And he will understand that millions … will be killed. It’s a fact,” Zelensky said.