Let’s cut to the proverbial chase: what will Marine Le Pen do if she reaches the Elysee? The truth is that we don’t know, and neither, probably, does she. As we witnessed with Brexiteers and Trump: often the populists don’t have a plan beyond winning.
She’s given clues, of course. She’s said she will withdraw France once again (as de Gaulle did) from NATO’s military command (but not seemingly NATO itself) and it’s not unreasonable to think that she will stop French support for Ukraine. She has suggested that she does not feel France is bound by NATO’s article 5 guarantee to defend any NATO member that is attacked. If true, that is huge, because France is physically vital to NATO’s defence of Europe. A Europe without French access will struggle to be supplied by the US. It would, in short, be an act of treason against Europe.