Undetected.

This is coolbert:

More reporting the Tu-141 drone crashing into NATO territory. 

Courtesy here "The Aviationist" and the story by STEFANO D'URSO.

Good embedded images and some video.

"Tu-141 Drone May Have Crashed In Croatia After Flying Undetected Over Romania And Hungary".

"The mysterious  drone probably flew all the way from Ukraine to Croatia after the control signal was lost, crashing when it ran out of fuel."

A Tu-141 on launch platform. Booster rockets take the plane into flight. Swift UAV recoverable with parachutes, reusable.

[....]

"According to the first investigation reports released from Croatia, the drone lost the control signal and flew until it ran out of fuel. Meanwhile, Hungarian sources said it arrived in their airspace via Romania, again without being detected by air defenses. The event is being treated as a serious incident and Croatia launched an investigation to try to understand how an old Soviet-era drone was able to fly undetected through NATO airspace."

[....]

ORIGIN STILL UNCONFIRMED. FLIGHT PATH UKRAINE-ROMANIA-HUNGARY-CROATIA. AIR DEFENSE NOT TRACKING!

coolbert.