Hmm. Assuming this was Russia, or a Russian sympathizer, it could be due to the Spanish police assisting with war crime investigations in Ukraine. (Source - https://www.reuters.com/world/europe/training-center-spain-ukrainian-troops-start-operating-end-nov-pm-says-2022-11-21/)

Searched the comments and did not see this theory so just my contribution. Spain announced this assistance recently.