Across Europe, governments are no longer containing their alarm to closed chambers — they are speaking plainly to their citizens about a Russian threat that is measurably intensifying. NATO, the alliance forged on the premise that solidarity is security, now finds itself divided over how to answer provocations calibrated precisely to exploit that division. The margin between deterrence and miscalculation narrows with each passing day, and the continent stands at one of those rare historical junctures where the decisions of a few will shape the fate of many.