There's already been US causalities. They will only "matter" if (1) we officially* send people into Ukraine or (2) Russia targets positions outside Ukraine where US forces exist. On #1 I think that would result in more gear being sent to kill more Russians, and #2 would probably result in a retaliatory strike. Remember what happened when the Russian "mercenaries" decided to move on US troops in Syria? Russia decided to test our resolve and pink mist was the results. But, the fact remains that such things can and have spun out of control and escalated in ways that can't be known, and that's why everyone wants to have nukes: countries will avoid war with you.
* No doubt there's spooks, SOF working for spooks, "advisors" etc all over the place assisting in killin' Russians.
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