USA are very well placed to ban Russian energy, since USA has plenty of oil and gas of their own. I think it's something like 5% of USA's energy needs imported from Russia, a figure that American energy companies can easily cover. Europe isn't quite so fortunate, there aren't that many gas reserves.

The UK is instead going to build more nuclear reactors and invest more in solar and wind. Oh and we're also going to dig more oil and gas from the North Sea, which has outraged the Greta Thunberg cult. Still, if it's coming from the North Sea instead of Siberia, that's less transportation, so slightly greener.