Honestly, it hasn't cost the U.S. much in actual money because we have only really sent them old equipment we already had, which was paid for decades ago, and which would have cost the U.S. money to destroy anyway. We even save money by not having to store it.
I really believe Peter Zeihan is correct and Putin's invasion of Ukraine has to be defeated or he will progress to attacking NATO countries. If we don't want WW3 then Russia has to lose in Ukraine.