[AmericanExceptionalist]

The geopolitics of this matters. If the Russians moved on Kiev (unknown at this time), they would likely not shy from encircling US Troops in Ukraine and escorting them back over the border.

Uh, why might you suppose that US troops are so docile as to allow themselves to be "escort[ed]...back over the border," ever so meekly?

[Mariner]

"Uh, why might you suppose that US troops are so docile as to allow themselves to be "escort[ed]...back over the border," ever so meekly? "

Because that will be their ROE. It will also be Russian ROE.

Only a fool commander would order a large battalion to fire on the Russian Army in Ukraine. Only a fool Russian commander would order fire on a thousand American troops unless their goal was existential war.