Our fight with Russia is more ensuring they don't get away with it than oil. Making sure Russia knows their place in the world and doesn't attack other countries, to include NATO, or do other shenanigans.
With all due respect, this is pure US imperial propaganda.
The US empire always wanted the destruction and balkanization of the Russia and China for that matter. Why else would the US empire continue to expand NATO after the fall of the Soviet Union?
Your statement of "making sure Russia knows its place in the world" is also very imperialistic as what nation on Earth has the authority to dictate another country's national interests?
If it was about oil, we'd have troops in Ukraine.
There would be WWIII if the US empire did that and that's why there currently is no US/NATO troops in Ukraine.
It's also about sending a message to China not to attack Taiwan which is a vital US interest for their microchip manufacturing. Russia's economy and population is wrecked and will be for a generation.
The US empire legally agreed that there is only one China. The Republic of China was never and is not a recognized nation state; hence, it is not the US empire's business to interfere in the domestic policies of another nation.
Oil and gas is involved. Weening Europe off Russian oil and gas and getting other countries to reduce.
Was that the EU's policy or the dictates of the US empire? With the US empire destroying the Nord Stream pipeline, I guess we already have the answer to that question.
Russia currently occupies Ukraine's oil and gas fields. If they retain that and the seaports, Ukraine will be more broke in the future allowing for Russia to take over in a third invasion, military or politically
Pure conjecture based on the false belief that Russia wants to take over its neighboring countries.
As for the Ukrainians, they should have never trusted the US empire or allowed them to instigate the coup in 2014 that started the ongoing tragedy in their nation