Two kilometers from Polish soil, a passenger train on the Kyiv-Warsaw line was struck by Russian forces on Sunday, at the very moment Western dignitaries including Boris Johnson and David Petraeus stood at a nearby station. The attack killed no one, but its proximity to NATO territory and its timing in full view of the world's attention made the message unmistakable: Russia is willing to test the edges of the alliance's threshold, and it is doing so with increasing precision and audacity. As Poland convened emergency security meetings and Ukraine's president called the strike deliberate, a sep