IIRC, it’s been Spain that’s been the strongest proponent of disallowing end-to-end encryption.

I’m guessing that this is because Spain has some substantial separatist movements and wants the federal government to be able to monitor them.

kagis

https://edri.org/our-work/chat-control-what-is-actually-going-on/

While certain pro-digital-surveillance countries like Hungary, Ireland, Spain and Denmark have unwaveringly supported the mass scanning and encryption-breaking measures, many other countries have been rightly alarmed.

They don’t have specifics there on a state-by-state basis.

https://www.wired.com/story/europe-break-encryption-leaked-document-csa-law/

Of the 20 EU countries represented in the document leaked to WIRED, the majority said they are in favor of some form of scanning of encrypted messages, with Spain’s position emerging as the most extreme. “Ideally, in our view, it would be desirable to legislatively prevent EU-based service providers from implementing end-to-end encryption,” Spanish representatives said in the document.

I’m pretty sure that Wired is referencing the leaked documents that I’m thinking of.