You'll need to be a little more specific as to what you mean by "armor"...Italian vehicles were often used by anti-partisan units in rear areas depending on the time in question.
The Italians initiated the campaign in the Balkans in 1941 by invading Albania and their failures on the Greek frontier (and elsewhere) required German help to correct and ultimately conquer and occupy Greece and Cyprus.
Italian units later served on the Russian front as well and were part of Barbarossa, so you could find Italian armor there depending on location and timeframe. HTH!