Aside from the vast amounts of government spending, where on earth is Europe - low birth rates and ageing population - supposed to find 300,000 fit and healthy young men and women willing to do this? Bring back conscription?
https://www.bruegel.org/analysis/defending-europe-without-us-first-estimates-what-needed
https://www.bruegel.org/analysis/defending-europe-without-us-first-estimates-what-needed
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But that’s an economist writing, and as Keynes so rightly observed: “Give a thousand economists spreadsheets and you get a thousand useless theories. Give a thousand economists trenching tools and you get civil defence.”
“You don’t mean?!”
“Yes, they’re sending a battalion of monetarists up to the front line.”
“Excellent! We’ll have the booby trapped copies of ‘The General Theory of Employment, Interest and Money’ deployed at once.”
Of course, that's not politically realistic, so...