Properly postured and readied ground and air forces as well as their key enablers are likely to be crucial for achieving this standard. Such forces need not be postured far forward or fixed in place like a new Maginot Line. Rather, a growing body of analysis suggests that they can be mobile and flexible—indeed, this will make them more resilient and survivable—but they need to be ready to move forward swiftly to contest Russian advances. Fortunately, the United States and NATO as a whole have made considerable progress in recent years in rectifying gaps in their defense posture in the East
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