Germany especially should really do some soul-searching. They are enabling Putin for the last few decades.
In the middle of the winter, economic sanctions have their hands basically tied. What is Europe going to do? Turn off the gas? I don't think so.
Maybe at least France will stop D%#$ing around and finish their reactor. The only question is can Putin put down the insurrections in Ukraine faster than the rest of Europe can untangle their energy dependence, or will it just be another Crimea where everyone forgets about it in a year or two, and Putin can pull it off somewhere else in another 5 years.
And because blocking them from some technology that the West has monopoly over will invite a strong(er) drive from the likes of China and Russia to create a competitor and weaken the West's power in that field.