So far:
Pre-turn:
I move the Northern army down to the area near Entremont to avoid nukes. With a start, I notice that we left Matsuyama, Desert Fish, and New Nagoya undefended - if any of those territories fall into Greek hands, they can start work on the Stasis Chamber immediately. I move some units into those cities to provide at least SOME defense against this.
I also pillage the Uranium near Desert Fish/New Nagoya - they're too lightly defended, and if Greece happens to attack them (unlikely), we're sunk.
I like the way that you're thinking here, though you are crediting the AI with far too much intelligence.
Having pillaged the Uranium - very thorough - you needn't waste defenders on them.
You will need the defenders for when they
do make landings.
In case you are not familiar with Modern Age warfare, I'll give you a few pointers.
Firstly, they will land a full compliment of units - it's not like the earlier Ages where they will sail half way around the world to drop off a warrior - typically a mixture of MI/TOW and Tanks.
The way to handle them is to wear them down over two turns - don't waste Tanks fighting full strength units.
First, move MI defenders to any towns which they can reach - in the North this will be 2 or even 3 towns. Then move Arty to the nearest town and soften them up; then re-base the Bombers to within reach.
If you make sure the towns are adequately defended, they won't attack on the following turn; instead they will move towards the nearest undefended town.
Hit them with the Arty again, then the Bombers. If there is anything left, send in the Tank Armies.
I suggest you rush a couple of Armies as soon as you have the Tanks to fill them.
The key point is not to panic; they do not have Battlefield Medicine, so they won't heal in our territory. You can afford to take 2 or even 3 turns to deal with them, just make sure to defend what they can reach in one turn, and wear them down with Arty until they are red-lined before attacking.
Until we build up our military we must conserve our forces this way.
Also, we are probably a bit lacking in Arty; see if you can spare a city to produce a few.
They still have 5 Nukes, and they may have a few more in the pipeline, started before we got to their U.
If they waste them on Northern towns, don't worry, but if they hit a core city you must get the Workers on the job, first to clear a tile, then to mine and RR it. It takes surprisingly little time to restore them to their former glory.
The biggest problem is with population loss, so in this event, switch some tax farms to Worker production for joining to the city.
The city will also lose up to 50% of it's buildings; I suggest you replace them in the order of Factory/ Coal Plant to get the shields back up (making it quicker to replace the rest), followed by Temple/Cathedral (to allow you to rebuild the population), then Market/ Bank.
We are a bit short on Workers, so use any built to reclaim the land before joining them to the cities.
Be sure not to keep Armies in or near cities when not in use; there are spaces in the core to keep them safe from nuclear fallout.
Don't base Bombers in a city with resources within it's radius - they tend to target those cities with Nukes.
Hope this helps.
Good luck.
Edit:
If it becomes necessary to switch govts, you will have to re-mm all of our tax farms - an unenviable task, but necessary, unfortunately.