At least, they certainly didn't make a missile with that kind of damage potential.
While it could throw a single 40 megaton warhead, it would more likely carry a handful of weapons topping out at about 50 megatons, total. Maybe.
Which is a lot, but nowhere near big enough to "wipe out" a medium-sized country like France.
They could pretty much destroy up to 15 separate cities with 300 kiloton airbursts (if the MIRV systems gives them that much spread and control, which it probably doesn't), but everything in between would be effectively untouched, and with a single weapon, most of Paris itself would only be lightly to moderately damaged. Modern high-efficiency weapons don't drop a lot of fallout in air burst mode, so that's not a consideration.
If they used ground burst targeting, they could cause a lot of downwind fallout, but it would leave large areas untouched upwind.
Forty to fifty megatons sounds like a lot, but when you compare it with how big the world is...