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According to Wikipedia: France and weapons of mass destruction - Wikipedia
The French have 350 nuclear warheads. That would be enough to destroy every major city in Russia. And then have enough left over to do the same to the US.
It’s unclear what delivery systems they have.
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No it’s not. The French Force de frappe is well known, consisting of the M-4 and M-45 and M-5 and M-51 SLBMs (roughly comparable to the Polaris and Trident families, respectively) and the ASMP air-launched supercruise missile. (The land-based components of the Force on frappe triad were decommissioned in the early 'Nineties due to obsolescence and maintenance cost.) For the French, building a “nuclear deterrent” was more about showing independence from NATO and opposition to a re-unified and potentially nuclear-armed Germany than any real strategic need; while its arsenal is large, it is dwarfed by US and Russian (formerly Soviet) arsenals, and in any exchange specificially directed at France it would come off far worse in terms of parity.
As far as the question of the o.p., the National Command Authority (normally the President, but in his absence, incapacitation, or death, the next highest available person in the line of succession) can give the order to initiate a strategic nuclear operations plan; this is typically done from the White House Situation Room, an Advanced Airborne Command Post (AACP, formerly called NECAP) which is an aircraft (currently a Boeing E-4), or if mobile from the so-called “Nuclear Football”, a special portable communications node. The President must relay a set of codes confirming his identity, and the Vice-President, a member of the United States Cabinet, or a member of Congress must confirm the order; that is, they must confirm that (in their opinion) the NCA is sound in mind and otherwise has sufficient capacity of judgment to initiate this order. Once the authorization has been confirmed, the NCA then selects specific Contingency Plans or specific sites for targeting, and the United States Strategic Command (USSTRATCOM, formerly the Strategic Air Command) takes care of the business of figuring what actual assets will be used and how the strike will be coordinated. (Contrary to popular belief and movies starring Matthew Broderick, NORAD has nothing to do with actually launching missiles or deploying other assets and merely provides information on potential threats.)
Actual launch operations vary; for Minuteman III and (now decommissioned) Peacekeeper land-based ICBMs the “two man rule” described above is true as applied to the launch complex crew. In addition, release codes for the Permissible Action Links, received from the launch authority (USSTRATCOM) have to be entered in as the first step in arming the weapon, which prevents the launch complex crew from getting a wild hair to being Armageddon before the officially sanctioned time, although the simple mechanical PALs on the original Minuteman fleet were set by SAC to the same combination–00000000–to prevent any problems with transmitting the codes. (The warheads aren’t fully armed until terminal flight to prevent accidental detonation.) Submarine weapons also have, or had, at least a two man rule (some sources say three or more); however, actual release codes are stored on the sub in case of limited or interrupted communications. Air launched and ground-based tactical weapons are released to local control at specified alert levels, but since these weapons are almost all in the Inactive Reserve of the Enduring Stockpile (some are still transitioning from Hedge Stockpile to Inactive) it is a strictly academic issue at this point.
So, no, the President can’t just push a button as so amusingly depicted in the Genesis “Land of Confusion” video. He could arbitrarily authorize a launch, but he’d have to get some Congressionally-sanctioned person to confirm him of being in sound mind and judgment. Once the order goes out, USSTRATCOM has to execute the plan; if the plan makes no sense, they’re probably going to dial up someone at the Pentagon and ask if the Prez is out of his ever-livin’ mind, and then they’re going to call NORAD and ask why there aren’t any red streaks on the thread board, and et cetera; by the time it all gets sorted out, the President will no doubt have moved onto simultaneously solving the problems of homelessness and hunger, and everything will have gone back to more-or-less normal.
Anecdotal story; at some point late in the Nixon administration, Nixon was supposedly demonstrating some seriously (i.e. clinically) paranoid tendencies, suspecting that the Soviets were secretly undermining him in retaliation for opening relations with the PRC, et cetera, and Henry Kissinger advised the JCS not to accept any orders from the President without first crossing his desk. Of course, since this story is recounted by Kiss, one might question the strict factuality of it; nonetheless, one may assume that should the President start seriously failing in his mental facilities unofficial actions will be taken to see that he does not do serious and irreversible harm. The ones you have to worry about are those that seem both sane and sober.
Stranger