We begin by preparing by building trenches along the border. Putting AA guns in proper places and giving notice to militas and our allies. We also mobilize our tanks and such to make sure they are prepared. We also get our airplanes ready for combat.
Our AA and airplanes will make it so bombers are ineffective ( we have made a new AA gun, btw), also tanks will be mostly ineffective against us due to our superior tanks ( in tank battles) and AT.