Schill said France could engage a division of 20,000 troops within 30 days to operate as part of an allied coalition. Paris, he added, would be able to command a force of around 60,000 soldiers made up of French and other allied troops. The French army comprises some 121,000 soldiers, with 24,000 reservists.
The biggest issue is that the French army, much like any other western army, has no experience in fighting peers. The only two countries in the world which have that are Russia and Ukraine. French officers themselves admitted that the russian army is not the main (arguably only) reference when it comes to peer-to-peer combat operations.
French troops would not fare any better than the élite, nato-equipped ukrainian brigades that smashed their heads against the Surovikin line.
I will say this tho - i never thought i would live to see german tanks burn on russian soil again, and i am sort of excited to see the french being beaten out of russia again