I don’t think we can clandestinely place troops from Germany into position in the Ukraine. Any movement on their part would be known.
That’s why a drop by air strikes me as the best way to put a cannon fodder trip wire in Putin’s way.
In any case, I don’t expect the US to do it. However, on a different note I’m not real sure Putin and Obama aren’t working in concert.
I was suggesting open deployment. You are certainly correct that it cannot be done in secret.
Air deployment precludes armor and most artillery.
To me that would be suicidal. Putin would ignore them.