NATO Secretary-General Mark Rutte has described Ukraine as the “first line of defense” amid a surge in Russian drone and aircraft incursions into Polish and Estonian airspace. Speaking at the Warsaw Security Forum, Rutte said NATO must strengthen deterrence and improve air defenses after recent incidents involving drones in Poland and MiG-31s in Estonia. JOIN US ON TELEGRAM Follow our coverage of the war on the @Kyivpost_official . “In Denmark, we are still assessing what is behind it. But when