The ship looks nice on the surface but within it's full of technical limitations... let's look at the engine. 19 knots is an embarrassing top speed for a 21000-ton amphibious assault ship. You could say they'd be assaulting over-the-horizon so it's fine, but boy, it's still an amphibious assault ship. Speed is still of essence here.
Next thing, defense systems.
MANPAD and machine guns for point defense. lol. I wouldn't be surprised if Russia stripped them off and refitted the ship with Tor and AK-630 instead, or maybe even the missiles-and-guns integrated CIWS Kashtan, but that could just be overkill - it's the most advanced CIWS actually in service out there.
ASW is entirely reliant on helicopters - no torpedo or mortar tubes - nothing.
Anti-ship and anti-missile systems are non-existent, except for a 30mm gun... good against speedboats, I guess.
Anyone who says France's radar and EW systems are better than Russia's should jump over a cliff now.
But then I don't think Russia could have found any better ship from anyone else who were willing to build one for them, and Russia can always compensate for France's technological inferiority by themselves anyway any time they need to when they receive the ship.
The ship might be cutting-edge for France, but that's it. It's not the technology involved in the ship that has attracted Russia's attention - rather they don't want to pressure their ship industry for building ships like this when they have something else better to build or maintain, when someone else can build it for them.