Poland scrambled fighter jets and called an emergency government meeting on Wednesday after what officials described as a significant incursion of Russian drones into Polish airspace, prompting Prime Minister Donald Tusk to request consultations with NATO.

Tusk said Polish airspace was violated 19 times during the early-morning events and that at least three drones were shot down by Polish jets with support from Dutch F-35s and an Italian early-warning aircraft. He said the violations took Polish forces deeper into sovereign airspace than in earlier incidents since Russia’s full-scale invasion of Ukraine began in February 2022 and warned that Poland was “at its closest to open conflict since World War Two.” He asked NATO to invoke Article 4 of the treaty, which allows member states to consult when they perceive a threat to their security.

Moscow pushed back against suggestions the incursion was deliberate but stopped short of denying that its drones traversed Polish airspace, saying in a statement that “no objects on Polish territory were planned to be targeted.” European defence ministers and analysts, however, dismissed the possibility that the scale and route of the incursion were accidental. Germany’s defence minister, Boris Pistorius, said there was “no evidence whatsoever” that so many drones would have flown that route by accident, and Italy’s defence minister, Guido Crosetto, called the operation a “deliberate attack” aimed at provoking and testing NATO.

Initial reports indicated some of the drones flew in the direction of Rzeszow airport, a major logistics hub used for defence supplies and humanitarian aid bound for Ukraine. That raised particular concern among NATO countries because of the airport’s role in sustaining Kyiv’s war effort.

Analysts and researchers are divided over Moscow’s intent. Dr. Marina Miron, a defence researcher at King’s College London, cautioned against drawing conclusions from limited information and suggested GPS spoofing or guidance errors could have caused the drones to stray across the border. “There is an issue with proving intention,” she said, noting that disrupted navigation can make an incident appear deliberate.

Others said the number of craft involved and the pattern of recent Russian activity point to a deliberate probe. Justin Bronk of the Royal United Services Institute said earlier incursions typically involved single or very small numbers of drones and were easier to explain by technical failure. Justin Crump, chief executive of risk and intelligence firm Sibylline, said the drones resembled Russian-made Gerbera models—relatively inexpensive, long-range unmanned aerial vehicles often used as decoys to saturate defences. He said the absence of warheads on the craft might reduce the immediate lethality but could permit Moscow to downplay the episode while gathering intelligence on Western responses.

Keir Giles, a senior fellow at Chatham House, described the episode as a test for Europe and NATO irrespective of Russian intent. “Russia will learn from European resolve and specifically Poland’s capacity to withstand attacks of this kind,” he said, adding that muted responses or mere condemnation could encourage further escalation.

Poland said it would review the incident in detail and share findings with allies. Western governments face a choice over how forcefully to respond, balancing the need to deter future incursions against the risk of direct confrontation with Russia. European proposals to deploy a “sky shield” of NATO aircraft to protect Ukrainian airspace have been discussed since 2023 but have not been implemented amid concerns about accidental clashes with Russian forces.

The United States drew immediate condemnation from some lawmakers on both sides of the aisle, but President Donald Trump’s public reaction by Wednesday evening was limited to a brief social media post that noted the violation without outlining specific measures. Trump’s comments followed a period in which he has both hosted President Vladimir Putin at the White House and warned of sanctions if Moscow does not reach a settlement with Kyiv; there has been uncertainty in Europe about the extent of U.S. commitment under his administration.

Allies and analysts said they would watch closely how NATO and Washington respond in the days ahead. Poland’s Article 4 request is expected to bring NATO members into consultations that could include intelligence-sharing, a closer examination of air-defence posture on alliance territory and discussion of possible steps to raise the costs to Moscow of further incursions.

Since Russia’s full-scale invasion of Ukraine, NATO members bordering Ukraine have reported periodic airspace violations and incidents, but officials in Warsaw and in several European capitals described Wednesday’s events as unprecedented in scale. The episode is likely to shape NATO discussions about air-defence deployments, rules of engagement and the broader question of how to deter future episodes that test alliance unity and resolve.