Game was released a while ago. Seems multiplayer is offline or everybody's moved on. There is a way to add computer opponents. That's what I played.
The level of micromanagement needed to play this is truly astounding. You get a dozen aircraft carriers, each holding multiple fighters and bombers, and you must launch each aircraft independently. Then you have to click on the next carrier and repeat the process. Adding to this, the battle groups are tight and misclicking is virtually guaranteed. There's a lot of reclicking. I probably did more reclicking than anything else.
Ballistic subs are apparently worthless. They require a long, long time to launch, are surfaced and are vulnerable during this period... they can also be destroyed by a single shot from anything during this. I can safely say 90% of my nukes launched from subs never left the sub.
ICBMs take a very long time to reach their destination and can also be shot down. I decided that tripling or quadrupling up on a target was the only reliable way to hit. Alternatively, the computer opponents all launch at the same time, allied or not, a few minutes into defcon one. Attempting to join them is viable, but boils the game down to a blind-luck gamble. I'd prefer to flip coins or roll dice.
Bombers did the best, if accompanied by a flock of fighters. The fighters don't actually fight anything off, they just draw fire. It's important to note that aircraft have fuel and you can only use half of the visible range (a circle on the screen.) If you overshoot, they crash on the way back. Pure guesswork.
There are zero strategy guides on how to get ahead of the computer as of this writing, using any search engine. I can safely say I firmly, squarely, and completely lost all half dozen games I played. Most games I have zero nukes remaining unfired and they were all simply shot down. I genuinely have no idea how to improve.
I can honestly say I'm very disappointed.