CIA Director William Burns offered a stark warning to lawmakers on Capitol Hill on Thursday: If you don’t approve aid to Ukraine now, Kyiv could lose the war by the end of the year, Politico reports.

Speaking at an event at the George W. Bush Presidential Center, Burns urged lawmakers to pass the supplemental that would dedicate billions to Ukraine’s war efforts.

“With the boost that would come from military assistance, both practically and psychologically, Ukrainians are entirely capable of holding their own through 2024 and puncturing Putin’s arrogant view that time is on his side,” he said.

But if that doesn’t make it through Congress, “the picture is a lot more dire,” he continued. “There is a very real risk that the Ukrainians could lose on the battlefield by the end of 2024, or at least put Putin in a position where he could essentially dictate the terms of a political settlement.”