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Highly manoeuvrable stealth drones are remarkably easy to make. A bunch of university students in Oklahoma made one in 2017.
The best way to stop them is probably through jamming or other electronic warfare.
Russia and the US (via Ukraine) are in a drone arms race which largely consist of making more sophisticated jammers and detectors vs more jamming resistant and harder to detect drones. And based on this article it's not a race the US is winning.
That stealth drone project looks cool and if that's a capstone project from 2017, detecting them through means other than detecting their radio signals will be very difficult. Though they used an extremely weak radar (60mW) and a very high frequency one (40GHz) so they did very much set themselves up for success. The fact that they lowered detection range from 100m with a baseball to like 20m is still impressive for an (undergrad?) university project.
Edit: sorry for the paywalled article. I read it earlier this year and didn't realize the reader view was disabled now. Trying to see if I can find a way around it for this post.
Update: Here ya go!
Yeah stealth aircraft are more vulnerable to lower frequency radars, it's how the F-117 was shot down over Serbia. However that does usually reduce the rage of your radar, which is the opposite of what you want with regards to early warning radars.
I think honestly to get a proper shot of detecting the radio signals of the drones and potentially jamming them at source, or even launching missiles at the source, you'd need some kind of electronic warfare aircraft. That is an asset that Ukraine does not have and will not be getting anytime soon. I can't see the US giving Ukraine some old EA-6Bs with updated EW capabilities or anything like that. Jamming the drones by placing jammers near or around potential targets is not going to cut it long term. You need some form of signals intelligence. Ukraine's military realise this, even in the article you posted.