In the occasion of the G7 Summit to be held in Taormina on May 26th and 27th 2017, from May 10th to May 30th 2017 Italian border control at other Schengen Countries borders will be temporarily reactivated in airports, ports and terrestrial points of entry.
During this period of time, to enter Italy from other Schengen countries you must therefore be in possession of a travel document/permit to stay.