So the CIA explicitly did what they are chartered to do? They spied on conversations taking place in another countries embassy?
While it might be the subject of a court case in Spain, it probably will not play out the way Assange apologists hope. The actions taken by Undercover Global at the behest of the CIA were likely coordinated by the CITCO and with the blessing of the British government.
I doubt Spain would be doing an investigation into the case and arrest people if it truly was properly coordinated with Spanish intelligence networks. And even if they did coordinate it still wasn't seen as legal by the Spanish justice system as the case has been going for years and it is still making progress.
While it might be the subject of a court case in Spain, it probably will not play out the way Assange apologists hope. The actions taken by Undercover Global at the behest of the CIA were likely coordinated by the CITCO and with the blessing of the British government.