"If you think the cost of supporting Ukraine is high now, think about how high it’s going to be in national treasure and in American blood if we have to start acting on our Article Five commitments," U.S. National Security Council spokesperson John Kirby said.

“If you think the cost of supporting Ukraine is high now, think about how high it’s going to be in national treasure and in American blood if we have to start acting on our Article Five commitments,” U.S. National Security Council spokesperson John Kirby said.