Just build nukes if you are afraid of Russia then nuke them if they try to invade. Ukraine is not as smart and gave up its nukes in the early 90s, and is now in the middle of a war for the last couple years.
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Build nukes and plenty gigantic bunkers for the population, nothing else. And then follow the doctrine of immediate nuclear escalation upon any territorial infraction. Plane got off course in bad weather? Grab your Sauerkraut and bye bye Moscow.