I think the current sanctions against Russia are misguided. Yes, we want to support Ukraine, and certainly we should not export weapons or semiconductors.
But I can't follow the argument that petrodollars would help Russia that much. Before and since the 2014 annexation of Crimea, Russia has exported oil/gas without restrictions.
Yet it has been unable to build up an army that can proceed much more than 50 km in Ukraine. IOW, the petrodollars have not helped at all.
Now we are buying LNG via China and ship it to Europe using polluting ships. We are destroying our economies for no reason. Use targeted sanctions and let the elites in Russia embezzle the petrodollars and buy stuff that can't be used in the war (Ferraris etc.).