In an interview for this Sunday's "60 Minutes," Scott Pelley spoke with US President Biden about the situation on Ukraine, CBS News reported.

"As Ukraine succeeds on the battlefield, [US President] Vladimir Putin is becoming embarrassed and pushed into a corner," Pelley said to President Biden. "And I wonder, Mr. President, what you would say to him if he is considering using chemical or tactical nuclear weapons."

"Don't. Don't. Don't. You will change the face of war unlike anything since World War II," Biden responded.

When Pelley asked what the consequences would be if Putin crossed that line, the president wouldn't say.

"You think I would tell you if I knew exactly what it would be? Of course, I'm not gonna tell you. It'll be consequential," Biden said. "They'll become more of a pariah in the world than they ever have been. And depending on the extent of what they do will determine what response would occur."