For the US, this is an extremely cheap [1] way to counter Russia. Ukraine is doing 99% of the work. We give them money which they immediately give back to us to buy hardware. Or we give mothballed hardware slated for destruction. Most prefer this to a future with dead Americans and US boots on the ground in Europe when NATO countries are invaded by Russia, emboldened by a world that gave up on Ukraine.

[1] as a percentage of the US$850,000,000,000 _annual_ Pentagon budget