A Russian drone was shot down by an air defense system and crashed into an apartment building in Galați, Romania. A fragment of a Russian drone was found in the town of Siret last month. The attack with a drone that entered Romanian airspace is the most serious security breach since the start of the war between Russia and Ukraine, the Romanian Ministry of Defense said in a statement on Tuesday. A Russian drone penetrated Romanian airspace and struck an apartment in Galați. The aircraft was detected by the Romanian radar and was chased by two F-16s. Although the drone was chased deep into Romanian territory, the pilot apparently did not have time to release a missile, and the drone hit an apartment building. The attack has caused significant implications. It is the most serious security breach of Romanian territory since the start of the Russian invasion in Ukraine, and it is a clear sign that the war is becoming a regional conflict.JOIN US ON TELEGRAMFollow our coverage of the war on the @Kyivpost_official. Structural problems The incident exposed structural problems on both sides of the conflict. While NATO is operating in a new environment characterized by shrinking margins of error in deterring conflicts to avoid their escalation, Russia is increasingly employing low-cost, low-altitude and hard-to-track drones for its attacks on Ukrainian territory and in its hybrid operations against other neighbors. In other words, drones are becoming one of the many tools Russia uses to test the limits of NATO’s commitment to defend its member states.