You have commited strategical and tactical errors. And both have to be solved.
-Strategy: the great advantage in this scenary is the surprise factor. You choose when attack so a well planned joint attack is the best option.
Now you have to value threats. In this occasion there are three principal threats: enemy air force, enemy artillery and enemy missile defenses.
Enemy air force is mostly obsolete, it is not a considerable threat to your surface groups but it can face your falcons
with floggers and fulcrums. So you have to set a combat air patrol in the area where your attack aircrafts will be
Enemy artillery is the greatest threat to your garrisons in the islands. And defending them is one of your principal
objectives. Going one by one is worthless, you will have loses before you reach last enemy artillery unit. The solution is
destroying them at the same time.
Notice that if you make any attack against the enemy before finishing artillery threat, it is probably that they will
start firing. So this must be the first offensive you do.
There are two types of missile defenses, SAM and surface-surface missile batteries.
KN06 SAM is the biggest threat to your air operations and one SA-2 (SW of North Korea). You have enough TAURUS cruise
missiles to destroy them. Try to avoid that your cruise missiles overfly other SAM in order to do a succesfull attack.
Also HARM missiles are suitable against SAM (active emission required)
Fly low and fast when in range of enemy SAM.
-Tactical: know the capabilities of friendly and enemy units, weapons and sensors efectiveness. Ex: dont use Mavericks against hardened bunkers, dont face Falcons armed with WVR missiles against Mig-29...
Manage your units adequately, when you need or may need them, use them, when not, not.
Dont expose your most vulnerable units to enemy attacks...
You will lear this by trial and error.
You can make a txt file for each unit collecting its actions in combat, successes and fails. So in a future you will know if you are going to succes or not by consulting your history in previous scenarios. Or you can ask here, of course.
Sorry for english grammatical errors