Originally Posted by
etch5895
so there shouldn't be a need to re-clear security.
There is - all passengers arriving from outside the EU and continuing on another flight must be screened (EU-mandated).
If for some reason UA does not interline your bags, then you will have to claim in them in T2, clear customs, then walk them across the plaza to T1. Note that the Christmas market is going on on the plaza, but early in the morning most stands will still be shut.