If I'm a holder of
two Ukrainian foreign passports (it is legal in Ukraine) and only one of them is biometric
Bulgarian blue card binded to non-biometric foreign passport
is it okay to first enter EU (Bulgaria) with non-biometric passport and Bulgarian blue card and after that enter another EU Schengen country (e.g. Greece) with my second biometric passport?
If that is allowed and if then I'll back to Bulgaria from Schengen zone will 90 days counter be stopped? Do I have to inform Schengen zone border control about my Bulgarian blue card in order to not get any entrance problems later?