The nine principles of war that were so hideously violated by the Russians in February of 2022 are:
Mass
Economy of Force
Initiative (offensive)
Objective
Unity of Command
Maneuver
Simplicity
Security
Surprise
I believe the Ukrainians are wisely creating economy of force defensive areas so that they can have mass at the decisive points of the offensive. In the prolific drone age this is not easy to conceal from the enemy, but you can also play to the enemy eyes in the sky and develop deception plans based upon what you want the enemy to see (Quaker gun positions, frenzied activity where nothing will happen, etc.)