If Russia was intentionally going to do an attack outside Ukraine they would do a bigger one, likely with Oreshnik and on a military target. I think two most likely possibilities here is either a stray drone or Ukraine using a scavenged one to try draw NATO in.
It has begun—the very thing you and I discussed long ago… The thing I was banned for for 10 days—it has happened.
https://www.bbc.com/russian/articles/cx21rjge20po
Here is the move by Russia that could produce the intended effect.
If Russia was intentionally going to do an attack outside Ukraine they would do a bigger one, likely with Oreshnik and on a military target. I think two most likely possibilities here is either a stray drone or Ukraine using a scavenged one to try draw NATO in.