I don’t think France really offers a chance to distract Germany from building a navy. From what I can tell most German naval buys are turn 1 (an aircraft carrier and 3 transports seems to be popular) and even if France does survive turn 1 Germany is going to attack with what it has currently (including its massive air force) and won’t build units to deal with France the next turn. I suppose it stops Germany from building stuff in Normandy and Southern France, but that isn’t too popular anyway. A German navy isn’t that popular, anyway.
In my opinion, it doesn’t offer much help to Russia either. Russia’s in a pretty good position to hold out for a while whatever happens in the West, though I suppose it could theoretically delay Germany from taking Moscow by a turn if Paris doesn’t fall round 1.
The main thing, though, is Paris really almost always falls turn 1 to Germany (like 95%, at least). Its survival to turn 3 indicates a terrible German player, which would spell doom for the Axis anyway. So any chance of France diverting German attention is pretty much theoretical, anyway.