I don't know if this is true. But one thing is sure. I am immensely grateful to BOTH the US and Ukraine. The US for its contribution to funding and weapons. The Ukrainians for their bravery, skill and blood.
I don't think the US should be demanding gratitude from Ukraine. Ukraine is fighting its war for all of us. We really ought to be grateful to them. Their share of the burden is the greatest. And the opportunity of a more peaceful Russia after the war will be a relief for everyone.