I would agree with this if the American President wasnt Russia's stooge.
There is no way to "work together" to combat Russian aggression because the piece of the American Government that usually coordinates diplomacy would rather be allied with Russia than the EU.
Thinking the Russian sanction bill is about the EU at all is not accurate. It's really about sending a message to Putin that fucking with our elections will only make things worse for him, and not better. It's why it passed both chambers of Congress with like 95+% of the vote. It is why I have been faxing my senators and representative every day for two months telling them to get this bill passed into law.
It's unfortunate that Merkel wants to be a modern day Neville Chamberlain, and appease Russia instead of standing up to them, but the world will survive and so will Europe. There are other places to buy oil and gas and if they want to put tariffs on US LNG or only buy from Canada, then I would still support these sanctions, because maintaining Western democracy is more important than marginally cheaper electricity.
Europe has a storied history of not dealing with totalitarians in its own backyard, and is doing a bang up job living up to the past, here and is seemingly only willing to condemn Putin up until to the point where it affects their bottom lines.
For those Europeans that say sanctions don't work, I urge them to look closely at their own history and compare modern American sanctions strategy in NK, Iran, and Russia to the European appeasement strategy in the 30's and report back which was a bigger failure.