1% OF THE PENTAGON BUDGET IS ENOUGH TO BUILD A 7 LINE DEFENSE AS THE DEFENSIVE LINE FROM SWEEDEN TO HUNGARY ALL THE WAY TO ROMANIA.

Summary:

• Number of bunkers: 40,000
• Total cost: 4 billion USD

So, it would cost approximately 4 billion USD to build 40,000 bunkers, spaced every 50 meters, along a route from Sweden to Romania.