This reads as if the US Army had units in Ukraine fighting their dirty war for them.
... did we?
Maybe they are just paying attention to what the Russians were doing in the Ukraine.
No but we pay very close attention to what is happening there with Russian weapons and tactics. The Ukrainians are only too happy to share with us.
No, we were not engaged in Ukraine fighting.
Instead, it is important to learn from your own mistakes, and MUCH cheaper to learn from the mistakes of others. Why pay for a mistake when somebody else is already footing the bill?