The US doesn't need to do this, nor does France. Interested parties would include the Baltics, Poland, the UK and even Russian factions. Although the UK might put unecessary pressure on its own gas acquisitions by doing this. Ukraine is excluded because Germany would refrain from giving them any more weapons then.
Depends who. I could very well imagine a few countries (my own, France, for example) forcing a situation where energy-driven complacency isn't on the table. But it does make more sense for this being something that comes from the US.