Thank-you, that is a great analysis.
The concept of an EU army has no teeth under the current membership. Add Turkey to the mix and an EU army becomes a threat to Russia and any other European state that is a non-member.
With Russia, even if Turkey was to get in, it would hand the EU its rear end.
There is no way in hell Russia will allow Turkey to take over Europe. Should Turkey attempt to do so, war with Russia is very likely. Should Turkey turn into a terrorist (ISIS) supporting state again war with Russia is very likely.