The sanctions were spearheaded by europe, the US followed, initially reluctantly (Biden wanted some symbolic sanctions like freezing a few bank accounts and ban

The sanctions were spearheaded by europe, the US followed, initially reluctantly (Biden wanted some symbolic sanctions like freezing a few bank accounts and banning a handful of people from travel). It is european countries (and EU countries), that Putin claims are in Russia' sphere of influence (Baltic states, Poland, czech republic, etc). That stated nostalgia for lost power was easy to dismiss until 2022 (and I dismissed it). But the Ukraine invasion made it clear they cannot be dismissed anymore and if Ukraine becomes a military success for Russia, the next provocations and aggressions will target EU countries. So no, this is not something imposed by the US, it is a policy initiated by europe, for europe's benefit, and with the support of the US.