A nation that budgets more than $840 billion for national defense has reason to believe it is well-insured. But circumstances change. What was good enough before may not be good enough for long. 
Germany has formally signed on to buy 35 F-35s, which will begin delivering in 2026. The aircraft are being bought as part of a $112 billion accelerated military modernization program Germany launched after Russia invaded Ukraine.
The priority target for Germany's V-1 “Vengeance” weapon was London. To his peril, Hitler ignored military targets close to the coast.