5 Fighter & Bomber wings.
5 LRD (With Anti tank wep, about 400)
Keep your LRD within 35km of a target (city, capital , corporation etc etc). Attack the ***DEFENSES*** first using the Fighter & Bomber wings (You will lose a few units obviously). You need to continuously do this on the same target until a message comes up (something like this): The weapons you chose in this attack were not effective.
Close the screen, and at the bottom of the map there should be something that says ***choose targets*** or something along those lines. Click that, go to Army Unit then scroll half way down, and you'll find some helicopter wings.
ALL OF THE HELICOPTERS MUST BE TAKEN OUT! Do this once again using the fighter and bombing wings. You'll lose non here.
After that, click on a city / capital / town / fort etc etc and ALWAYS ATTACK THE DEFENSES FIRST using the fighter and bombing wings. That is crucial, else you'll lose a lot of units. After the defenses have been eliminated and you get the 'your weapons were not effective in this attack' message, attack with the LRD's. I would advise to have LRDs with Anti Tank weapons. It reduces the loss by a ton. 400 Anti tank should do it with 20k Ammo. If you do have Anti tank weapons, attack the DEFENSES first ONLY WITH THEM! Not the full LRD! <<<< TAKE NOTE! After the defenses are taken out, destroy at your will.
As my teacher told me before, if you want to keep a country, lower the war index by taking out all of the cities capital and the forts. DO NOT ATTACK THE CORPORATIONS.
If you want just loot from the country, destroy everything. Once done, do the following (ONLY if you want loot, not if you want to have a second country):-
Take control of the country - Simcountry Portal - My Countries - (the new country you took) - At the top of the country page should be SETTINGS - Go to automation - Automated System and uncheck 'create new corps every month' and put salary target at 100.
Now go to, War Tab - Garrison - Deploy Garrison - All Terrestrial targets (in the first big rectangle box) - undefend all targets. By doing this, all of that countries weapons will be back at their bases (within a few hours).
Once done, you can go to My Empire tab and transfer goods to your main country. You can also trade directly all of the products from that new country to your main. Trade tab - Direct Trading - Sell to country - Your own name - each of the products

Once that is done, and your happy with the outcome, go to MY EMPIRE and transfer cash to your main country. You can only transfer 3T per month so relax if you have to wait a month or two for the full amount.
If your happy with the outcome, then go to Simcountry Portal, Register Tab - Cancel Countries and click the little x for your new country. This will dereg you from it.
Toodles