Italy

Italy, a European country with a long Mediterranean coastline, has left a powerful mark on Western culture and cuisine. Its capital, Rome, is home to the Vatican as well as landmark art and ancient ruins. Other major cities include Florence, with Renaissance masterpieces such as Michelangelo’s "David" and Brunelleschi's Duomo; Venice, the city of canals; and Milan, Italy’s fashion capital.

The Transformers cartoon
The transcontinental Europa 2000 car race cut through Italy.

Victory cartoon
The Decepticons destroyed Egg Rock in Italy and used the site to spring a trap on Star Saber, involving metal-eating Doriya.

Young Corgi continuity
In the near-future of 2000 AD, Italy and the rest of Western Europe is part of the Federation of Western Europe.

Transformers/G.I. Joe
Italy was briefly conquered by the might of Cobra and their Decepticon allies in 1938.

Cybertron cartoon
Starscream's Ancient Decepticon army swarmed over the nation, spreading panic.

IDW Revenge of the Fallen comics
Under Soundwave's command, Fracture and her men Gunbarrel and Reverb landed in Italy. Fracture smashed into an Italian military base to find the others some suitable alt modes, then they destroyed the place.

They then proceeded to do... well, not much, cos NEST and the Autobots destroyed them all. Presumably this would make Italy a member of NEST.

The Veiled Threat
Starscream and Italian criminal Bruno Carrera made a deal, where Carrera would help to destroy Optimus Prime in exchange for ruling Europe for the Decepticons.

Under this plan, Swindle and Deadend begin causing chaos on the streets of Rome to attract Autobot attention. After this was achieved, Starscream challenged Optimus to a battle in the Coliseum.... where Carrera had arranged a trap door and set of restrains for Prime, bwa ha ha! The Autobots would've been terminated in this ambush if not for the human allies in NEST.

Carrera would later find out Starscream was very unhappy...

IDW Generation 1 continuity
Thundercracker arranged a meeting between Marissa Faireborn and her father on the Italian island of Sicily.