The world is witnessing an expanding pattern of aggression and belligerence from Moscow unparalleled in our lifetimes. NATO’s support for Ukraine is absolutely critical, and it should be increased to include longer-range missiles, combat tactical aircraft, combat helicopters, armored vehicles, and a steady resupply of artillery and munitions. However, the broader issue facing NATO is defining the optimal security posture Europe will need in future decades. This posture should support a Europe that is, in the words of the late US President George H.W. Bush, “whole and free,” not one constantly imperiled by threats from Putin’s Russia.