I don't think it's true to say that Europe and the US are equally willing to apply sanctions. The entire theme of the months before the invasion was that the US

I don't think it's true to say that Europe and the US are equally willing to apply sanctions. The entire theme of the months before the invasion was that the US was willing to go fast and hard on sanctions whilst European countries were largely split. As it turns out Russia's actions were so extreme that essentially it collapsed that split. But that's also because Europe is far more affected by Russia's war on Ukraine than the US. You see this in the exceptions to the sanctions- gas & oil that Europe is dependent on, and the support the US is providing in terms of procuring LNG for Europe. The US has demonstrably been working to enable and encourage Europe to sanction Russia.