There are no US forces fighting in Ukraine
I agree and also know there won't be. At least not overtly.
However, we SHOULD have some specops there to help organize and act as conduit for intelligence. Probably do.
That's way different than a uniformed and flagged Regiment within tactical distance of the Russian border.
That could be construed as an overt provocation by just about any country in the world.
Most have no means of real protest, others can cause some real misery over it.
Why suffer the consequence for no gain whatsoever? It's not like we are going to oppose the Russian Army if they decide to move with authority.
That will not happen, no matter how much the FR Cold Warriors hope for it. And the Russians know it.