Well, they can pay cash on the barrel head but it is the cash of U.S. taxpayers handed to them by the U.S. government.
They steal our money and use it to buy our weapons.
“They steal our money and use it to buy our weapons.”
So it’s basically a gift to our arms manufacturers, with, of course, 10% going to the big guy... and probably 20% going to the crooks who run Ukraine.
As somebody once said, “beware of the government-military complex”.