This was stated in an interview with CNN by the coordinator of strategic communications at the National Security Council, John Kirby.
Further aid could suffer without a congressional decision on additional appropriations, he said.
"We have some more funds. I think we will have enough of them for a few more weeks or so, "RIA Novosti quoted Kirby as saying.
Kirby also announced new deliveries of Abrams tanks to Ukraine in the coming weeks.
He also stated that Ukraine received from the United States everything necessary to conduct a counteroffensive.