Really, you have no one in mind? Someone who is sending hundreds of bombing drones daily to Ukraine, killing civilian population, women and children, and who is eager to send a message to NATO countries any way possible?
Up to the moment it has not been the operation adopted which would make it weird.
On who would do it then, anyone who benefits from instability. From corporations trying to sell flocked uped sytems, politicians, etc.
There is one south american country who was attacked exactly this way before their head of the government was kidnapped.