As they impose economic sanctions, it's not only US that will impose but as well as the EU/UK as Boris have said as well.
We can have that idea that the sanction was already activated when the stocks of Russia has fell a lot with the first attacks that Russia did to Ukraine. IIRC, Turkey has also been sanctioned by US during the Trump administration and look at their economy now. But for Russia, I don't think they'll be sitting for this sanction effect for long.