What is NATO's current defensive posture and future challenges according to Secretary General Mark Rutte?

According to NATO Secretary General Mark Rutte, NATO is currently fully capable of defending itself against Russian aggression, with a promise of devastating consequences should Russia attempt to capture even one square mile of NATO territory in countries like Estonia or Poland. However, Rutte expresses concern about NATO's defensive capabilities in the coming three to five years due to Russia's massive defense spending and industrial base. He emphasizes that Europe needs to increase its defense investments to maintain NATO's deterrence posture, while also noting that Ukraine will play a crucial role in any peace talks with Russia.