>it seems like an obvious thing to do for both Ukrainian intelligence
Yes it must be obvious for Ukraine to use people who are already in Russia to help with local sabotage. It could be as as crude as putting rocks on a rail line or as simple as floating toy balloons across a strategic installation until the local Russian defenses get tired of the false alarms, stop paying attention and don't see an incoming drone.
It's surprising that there are apparently no strong claims of this from either side, but especially from the Russian side. I don't agree that Russia has nothing to gain from arresting people for such activities. Wouldn't it deter others?
Original art by Banksy is reportedly valued at millions of £ or $ [0]
The BBC says "Banksy works cost public almost £150k" because "The Ministry of Justice (MoJ) says it has spent £50,000 trying to remove paint from the wall of the Grade II-listed building in Carey Street."
Therefore, the title is incorrect. The cost to the public is much more than £150k. The Ministry's damage to this freely-contributed artwork has probably already cost the public a few million £, not just £150k
Have you considered that the public may be gaining something from the conversations and awareness that arise from the performance of this art? I invite you to move away from evaluating a piece of art simply in terms of the monetary cost to the tax payer.
The government has appropriated Banksy's artworks (e.g. the police sentry box), and could sell them. If the sale of those artworks exceeds the cost of cleaning others, then the government has netted a profit, which takes the monetary argument off the table.
That looks more like a very bad overly-literal translation of Spanish 'protagonista absoluto'. AI generated English would not probably use a phrase which doesn't normally happen in English.
https://github.com/ApelegHQ/ts-cms-ep-sfx