The US has enjoyed a strong alliance with Europe for decades. US and European economies are interconnected and interdependent. Europe expect the US to behave like an ally, the current Trump government does not.

Trump is hostile to Europe, but the entire American apparatus, soft and hard power, economic influence was built on this alliance. This makes the US more dangerous, more unpredictable then Russia. That makes the US a bigger threat, because the US can cause so much more damage to Europe. The US is actively supporting the only undemocratic government in the EU that fully support Russia against Europe.

Russia is killing European, Russia is committing war crimes every days, Russia is conquering Europe, Russia is destabilizing European democracies, Russia is spreading hate and misinformation.

Russia is a more direct and explicit threat to Europe then the US. The US has the capacity to do much more damage because Europe is integrated and dependent on the US then it is with Russia.

The article above seems to be on the side that to indiscriminately target civilian infrastructure is a war crime. The wording of the article can be confusing for sure.

Targeting civilian infrastructure like Russia does is a war crime. Just threatening to do that is not as clear. I think that nobody will doubt that to actually follow through with the threat would be a war crime.