I said before, if the US chooses to not provide aid to Ukraine, they leave Ukraine less choices. And one choice will be hitting oil infra (cheap, low risk and relatively low efford for Ukraine, very difficult and expensive for Russia).
So if the US wants to steer Ukranian military efforts, they can do so by providing the Ukranian military with means to dominate the battlefield. And even then, forcing the Russians to dedicate air defense to these maaaaaassssiivveee installations weakens their front line air defense.
Also the US is currently (one of) the biggest exporters of oil and gas. I imagine they are very heartbroken when making more profit on these exports.