I think mutual dependency is a good argument, except when one side has a much more valuable asset than the other side. In this case, Russia clearly had the most

I think mutual dependency is a good argument, except when one side has a much more valuable asset than the other side. In this case, Russia clearly had the most leverage in the situation. Energy independence may not be realistic for much of Europe, but avoiding a single point of failure / a dominant single supplier seems like it probably would have been wise.