I was thinking about the technology to destroy 7 billion dollars of Russian Bombers at several locations in Russia

 First of all, they launched these drones inside of Russia from Trucks. 

Next, these drones likely were disguised as Russian Drones so the common people and soldiers would think they were Russian Drones being tested or sent on some mission.

Next, it is my belief that they flew these drones under about 25 to 50 feet in elevation to avoid detection from any radar. So, unless someone was looking down from space and knew whose drones these were there would be nothing to stop them because no one would know what they really were.

I think this is the basic idea of why 7 billion dollars of Russian Bombers that dropped cruise missiles mostly on Kyiv and about 30 other cities were destroyed as well as a training base for crew members of these bombers at various airports across Russia some at least 1000 miles away or more.

Here we are seeing what it is possible to do even for Ukraine given the will and the money to do it.

Could they do this again and again?

It's possible that it will be harder next time because they have already done it once. However, 7 billion dollars in Russian Bombers that can't be flown anymore doesn't grow on trees either. The other interesting thing is that they say no one died while they destroyed 7 billion dollars in Russian Bombers either.

Do I believe this about no one dying? Maybe. not sure.