CDR SALAMANDER: What Europe Should, Could, and Would do in a Great Pacific War.
The Anglo-French SSN fleet numbers 13 boats. Using the optimistic “it takes three to make one” formula, that gives you four operational boats.
Assuming a Great Pacific War will require the USA to pull almost all its operational forces from Europe to the Pacific, there will be a significant—and smart—argument in Europe that they need to keep their forces at home to cover any threat from their east should it arise, and to secure the Atlantic that has largely been abandoned by the Americans.
As such, any fight in the Pacific would be lucky to get 50% of available operational units. That gives us… two SSN.
Not nothing, but a rounding error in a Great Pacific War. I would give it 2/3 odds that the national caveats would limit them to operations south of Singapore and east of Guam.
So, in the end, with the Great Pacific War, we should not count on much from Europe for this fight. Perhaps some security for Australian airspace and territorial seas, but that would be about it.
It gets lonely out there real fast.