Escalation as Russian Drone Enters Romanian Territory Near Ukraine
Drone tracked near Chilia Veche, 20 km southwest, then returned to Ukrainian airspace.
Debris search teams deployed after drone's return.
Zelenskyy said drone entered by 10 km, stayed in NATO airspace for 50 minutes.
Romania condemned Russia's actions, affirmed sovereignty, and will raise issue internationally.
NATO allies remain vigilant against airspace violations.