What Would Be U. S. Objective in Opposing Russian Army in Ukraine Wouldn’t Arming Her Defenders Be Wise?

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The U. S. could justify to any nation other than Russia that heavily arming the Ukrainians would be a good thing, while moving the U. S. military directly against the Russian army would be utter foolishness, after all, what would be the objective in directly confronting the Russian military north of the Black Sea?