Poland said early Wednesday that multiple Russian drones entered and were shot down over its territory with help from NATO allies, describing the incident as an “act of aggression” carried out during a wave of Russian strikes on Ukraine.

Several European leaders said they believed Russia was intentionally escalating the war, and NATO was discussing the incident in a meeting. It came three days after Russia's largest aerial attack on Ukraine since the war began, an attack that for the first time hit a key government building in Kyiv.

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“Russia’s war is escalating, not ending,” European Union foreign policy chief Kaja Kallas said. “Last night in Poland we saw the most serious European airspace violation by Russia since

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