President Joe Biden is sending a new tranche of emergency security aid for Ukraine on Tuesday, worth roughly $300 million, weeks after the White House indicated the administration had exhausted existing avenues to arm Ukraine’s forces.

National security adviser Jake Sullivan spoke about the funding during Tuesday’s White House press briefing. He claimed that the surplus stemmed from “unanticipated cost savings in contracts” the Department of Defense negotiated in 2023 to replenish U.S. stockpiles after sending equipment to Ukraine.