Poland scrambled fighter jets and placed its air defense systems on heightened alert overnight as Moscow launched one of its heaviest air assaults on Ukraine in recent weeks. 

The Russian attack sent shockwaves across NATO’s eastern flank just a day before Ukrainian President Volodymyr Zelenskyy is due to meet U.S. President Donald Trump to discuss a newly revised peace proposal.

Poland’s Operational Command posted Saturday on X that military aviation operations were launched in Polish airspace “in connection with the activity of long-range aviation of the Russian Federation carrying out strikes on the territory of Ukraine.” 

Fighter jets were scrambled and ground-based air defense and radar reconnaissance systems were put on readiness as a preventive measure to protect Polish airspace.

The move came as Russia attacked Ukraine overnight with nearly 500 drones — many of them Iranian-designed Shaheds — and around 40 missiles, including Kinzhal hypersonic weapons, according to Ukrainian authorities.

“Another Russian attack is still ongoing,” Zelenskyy wrote on X at mid-morning Saturday, saying the primary target was Kyiv, where energy facilities and civilian infrastructure were hit. He said residential buildings were damaged and rescue teams were searching for people trapped under rubble, while electricity and heating were cut in parts of the capital amid freezing temperatures.

Ukrainian Interior Minister Ihor Klymenko said at least one person was killed and more than 20 others were injured in Kyiv, with multiple civilian sites damaged and search-and-rescue operations continuing.

Zelenskyy said the barrage underscored Russian President Vladimir Putin’s lack of seriousness about ending the war. “Russian representatives engage in lengthy talks, but in reality, Kinzhals and Shaheds speak for them,” Zelenskyy wrote.

The attack came one day before Zelenskyy is expected to meet Trump in Florida to present a revised 20-point peace plan, including proposals on security guarantees and territorial arrangements, talks Trump has publicly framed as contingent on his approval.

Several hours later, Poland’s military said the air operation had ended and that no violation of Polish airspace had been detected.