Wednesday morning's incursion of Russian drones into Polish airspace led to jets being scrambled, an emergency government meeting being called - and concerns that Europe and NATO's resolve against Moscow may not be up to the test.
Poland's Prime Minister Donald Tusk said Polish airspace was violated 19 times and at least three drones were shot down by Warsaw's jets, aided by Dutch F-35s and an Italian early warning aircraft.
Russia has pushed back against accusations that the incursion was deliberate – though it also stopped short of denying its drones had trespassed sovereign Polish airspace.
No objects on Polish territory were planned to be targeted, Moscow said.
However, European officials have firmly dismissed suggestions that the act may have been unintentional.
There is no evidence whatsoever that this amount of drones flew over this route over... Polish territory by accident, Germany's Defence Minister Boris Pistorius said, while his Italian counterpart Guido Crosetto labeled the events a deliberate attack with the intent to provoke and test NATO.
Though Poland has faced numerous airspace violations since the conflict in Ukraine began, this latest encroachment was significant in its scale and depth, alarming officials in Warsaw.
Tusk noted that Poland is closer to open conflict than since WWII, requesting the invocation of Article 4 of the NATO treaty, which prompts discussions about threats to national security.
Analysts debate the motivations behind Russia's drone activities, with some suggesting reconnaissance purposes while others perceive a clear, intentional operation. There is an issue with proving intention, noted Dr. Marina Miron from Kings College London, who cautioned against premature conclusions.
Highly placed analysts contend the significant number of drones indicates a deliberate act, highlighting a trend in Russian tactics as a means to probe NATO's response capabilities.
Amidst ongoing evaluations, Poland will report its findings to allies as leaders reflect on the challenge posed by this unprecedented incident, assessing the broader implications for NATO and European security.
Whether accidental or intentional, this development is a crucial bellwether for NATO's collective defense strategy and illustrates how future engagements with Russia may unfold.