This article about Italian mafia supporting the looting of Roman artifacts and arms trade in N. Africa https://archaeologynewsnetwork.blogspot.com/2016/10/mafia-offers-rifles-to-jihadists-for.html#Xy2K1SjDEMxwGdi0.97 reminded me of the classic Atlantic slave trade triangle:
In the picture above (have to be logged in to see, I believe) the Europe node is interchangeable with US New England in taking agricultural products to convert to rum, textiles, etc which Africans want in order to export their slaves. Anyway, I think I see a similar trade triangle for Roman artifacts for Kalashnikov types of thing, assuming you consider Italy and the mafia as only catalysts and not a destination.
How about one node is Libya jihadists or the whole crescent of Isis destabilization. They allegedly dug up more artifacts in 5 years than predecessors have for centuries, and trade them for weaponry. The source of weaponry is a lawless fringe of eastern Europe like Ukraine and Moldova. They accept money that ultimately comes from the wealthy fringe of Asia (China, Japan, Russia, gulf oil states) for artifact loot.
So aside from the mafia lubrication (any drug involvement?}, the arrow for Roman artifacts goes from Arabic shores of Mediterranean to distant fringes of Asia. An arrow for money goes from Asia to extreme eastern Europe. An arrow for weaponry completes the triangle from e. Europe to Arabic unstable shores.
How to cure? Triangle trade should be fragile because it is limited by the weakest link. I think Japan could slow down import of artifacts, but not the other places. A timid peace-monger approach has not slowed down the looting. East Europe seems unready to stabilize with the Putin vs EU show. Maybe the mafias are weak links, but Italy only occasionally seems to take strong measures. Mussolini crushed the mafia(s) thru not just strong arm tactics, but things like elaborately protecting witness safety so they would testify. This has been revived at times, but not enough; s. Italy needs attention.