No matter what else happens in regards to the war there are going to be economic disturbances.
More of the same economic disturbances that drove Biden's numbers down in the first place.
That's on the mild end of the chart of what might happen, nuclear annihilation is at the other end. Boots on the ground is in the middle. China has declined to offer aid to the Russians saying: "Not our circus, not our monkeys, we don't want sanctions." So we're good there for now.
But however you look at it, it's the economy having the most effect. We're a fortnight into the war and if Putin sees the error of his ways and pulls out soon, there will be time for recovery before November. If things go well Biden will get credit and Dems will do okay.