Well that would be stupid of France to use nukes as a first resort. The deal with the whole MAD thing is that the first nation to use nukes gets nuked by everyone else. Nukes should really never be used until someone breaks the seal on them. Then whoever did that eats the nukes.
Waiting to see something that describes any official M.A.D. policy between any other nations besides US vs. USSR.
Today, the official policy of Mutually Assured Destruction appears to be nearly abandoned but it could be argued that it never was actually embraced fully by the Soviet Union, as is illustrated in
one instance by the case of one Soviet naval officer who might well have singlehandedly prevented nuclear war during the Cuban Missile Crisis.
Vasili Alexandrovich Arkhipov (Russian: Василий Александрович Архипов, 30 January 1926 – 19 August 1998) was a Soviet Navy officer credited with casting the single vote that prevented a Soviet nuclear strike (and, presumably, all-out nuclear war) during the Cuban Missile Crisis.
Richard Pipes is convinced that the Soviet Union always believed that
it could not only win a nuclear war, but go on to full survivability.
On the other hand, other specialists are now convinced that US intel had misjudged Soviet apprehension about even the possibility of a successful attack or retaliation, as evidenced by recently "partially" declassified studies by a Pentagon contractor (BDM)
1995 Contractor Study Finds that U.S. Analysts Exaggerated Soviet Aggressiveness and Understated Moscow's Fears of a U.S. First Strike
My point is, using MAD as any kind of a reference is and always was a bit like nailing Jell-O to a wall, but in any case, M.A.D. was only ever an agreement between the United States and the Soviet Union, and should not be assumed to be a past or present policy between any other countries, nor would it be reliable to assume that any policy exists wherein a
"first nation to use nukes gets nuked by everyone else."
Unless there are documented official policies to that effect, it's only a hunch as to how things would pan out. Furthermore, most if not all signatories to any remaining non-proliferation agreements and all nuclear signatories to current US and UN policies hinge upon criteria that is vastly different.
In any case, M.A.D. was an agreement, such as it was, between the US and the Soviets.
So was "S.A.L.T and S.A.L.T II".
(My father, SALT I and SALT II negotiator, second from Left - in Moscow)