Well I mean, it would quite obviously be in Germany's and most of Europe's best interest to eliminate their dependence on Russian oil and gas. Even at significantly increased costs, looking to the US to provide it, rather than Russia, is a much safer bet.
And while I agree it's not our responsibility, it is in our own best interests, because instability in the developed world in general, and Europe specifically, has direct negative externalities for the US.
I believe we should do everything we can to encourage them to go into business with us for LNG and oil. It would be profitable business for us, and it would increase security for them. That type of activity would of course require deposits and contractual assurances from the European states to producers and transporters on our side, but that's all quite do-able, just a matter of business.
But, if they don't choose to follow that path, we can't MAKE them engage in sound, secure energy policy. If they want to make short-sighted and stupid decisions to rely on Russia, there's nothing we can do to stop them.