Source? There are no EU laws. There are only directives, that member states need to implement, just like they need to implement the treaties they are signatory to, in their local laws. This is a good overview of the different directives and treaties that affect the members:
https://digital-strategy.ec.europa.eu/en/policies/copyright-...
I’ve never heard of “70 years after author death or, for a foreign work, the international copyright length, whichever is shorter”. It’s not in 93/98/EEC (that harmonised EU on 70 years)° or in the Berne Convention. But I’d be happy to be corrected.
° https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CEL...