To my knowledge, while LFI (but in particular Jean Luc Melanchon, who REALLY isn't even the cards to be PM) is certainly anti EU and made ambiguous statements on Russia as well as other countries, these views haven't passed on to the Popular Front. They have been perfectly clear in their program that they in support of Ukraine over Russia, and that they would continue (and increase) sending weapons it's way. This was the red line of the socialists, who are right now the biggest party alongside LFI, and supported by a majority of the rest of the aliance (esp the Greens).
The Popular Front is Pro-Ukraine, and against Russia. Diplo wise, on the question of the EU, they have said they want to get rid of the CETA (which has been a demand of the Left for quite some time, with good reason), and that they are lukewarm on the EU electricity market (which was really disadventagous to France because our energy prod is cheap, but prices are driven up for no reason in an high-inflation context), but they are otherwise pro-EU (remeber! The Soc-dems and the greens are a big chunk of the alliance!)
It's unfortunate foreign media (but our medias do it too) present the Popular Front as a LFI++ that is 'just as bad as far right' when it's a moderate left alliance against fascism.