In response to a large-scale Russian missile attack on Ukraine, Poland scrambled its fighter jets on the morning of Saturday, 1 February, and put its ground-based air defence systems on alert. Source: a statement by the Operational Command of the Polish Armed Forces,

At least four people have died overnight as Russian drone and missile strikes continued to pound Ukraine’s towns and cities and Moscow’s troops continue their grinding advance through the country’s ea

"Attention, due to the attack by the Russian Federation targeting facilities, including those in western Ukraine, Polish and allied aviation operations have commenced in our airspace," stated the Operational Command of the Armed Forces.