WARSAW, Poland — European leaders on Thursday expressed alarm over growing Russian hostility threatening their countries as Moscow's forces pursue their invasion of Ukraine — concerns exacerbated by events of the previous day when multiple Russian drones struck Polish soil.

The incursion into Poland, which came during unrelenting Russian strikes on neighboring Ukraine, deepened longstanding fears that the three-year war between Poland’s neighbors could precipitate a wider conflict. U.S.-led efforts to steer Moscow and Kyiv toward a peace settlement have so far failed to get traction.

European officials described the incursion as a deliberate provocation, forcing the NATO alliance to confront a potential threat in its airspace for the first time and compelling it to take stock of its mili

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