EU doesn’t have a joint foregin policy. Foregin relations is still an intergovernmental matter.
https://en.wikipedia.org/wiki/Common_Foreign_and_Security_Po...
https://www.euractiv.com/section/global-europe/news/borrell-...
It looks that I'm picking on him, but he is just a very good example. I can talk a lot about others, but this thread is politicized enough already.
Sadly this is one of the current issues of the EU project, nation-states flatly refuse to hand over anything related to defense. It's a great victory for the US.
Chances are this will not change until there is a serious rethinking of the European role in NATO. As long as the big decisions are taken there, there is no real role for an EU "ministry" beyond trade interests.