What if Kremlin stops supply (or we buying from them)?

Ukraine has already been called the biggest humanitarian disaster since the Second World War. 
In the mean time also Western Europe is feeling the consequences in terms of anxiousness and not only commodities like grain become scarce on the market but also energy.
It is not known wether Russian supply will stop because W. Europe doesn’t want it anymore (“blood in Russian gas”) or because the Kremlin  will close it. 
Fact is that for example the Italian Minister of foreign affairs is traveling to look for alternatives. He might encounter colleagues (in this case competitors) doing the same for their country. It is good to look for alternative supplies but in the mean time we must ALSO look to do more with less! 
Why do I not hear this on the news? Do decision makers think that it is too late for energy efficiency?
I say it is not. As energy consultant I visited recently an industry where up to 20% saving on natural gas & electric energy is probably feasible within half a year and that is good news that will last for years after the retrofit. It will put the industry in another position, especially when the scarcity is going to last.
And yes, it contributes also to a better climate, which was focus in the news during the last summer.
Let’s start now to act as any community during scarcity. Close the leaks while ensuring supply. That is looking to the future.

How are the US affected by all this?