the civil war in Ukraine
You have a very active imagination.
Look up what was happening in Ukraine from 2014-2022. I know the media always refers to the people living there as Russian-backed separatists but they are in fact Ukrainians.
The US only has those Abrams because it's cheaper to produce them than shut down the production line for a couple of years and then start it up again. Realistically speaking much of what the US sends should be valued at negative monetary value as Ukraine taking it means the US doesn't have to pay to dispose of it.
So why hasn't the US sent 200-300 tanks? Why did the US demand that Ukraine launch a counteroffensive with insufficient tanks and air support? Why is the US trickling in just enough equipment to prolong the conflict as much as possible without giving Ukraine everything it could possibly need to win. Why is US propaganda so different from the actions the US is actually taking?