The Greek government tried to extradite him by invoking "an anti-terrorist measure called a European Arrest Warrant (EAW)" - there are two sides to every story, but the way this one was handled sounds ... dubious at best.
Greek court gives UK dealer three years in prison
- The Antiques Trade Gazette
Although I've heard many claims that antiquities looting and smuggling funds terrorism, I've never seen any real evidence of this other than on a local level (i.e. finds sold locally for small sums by insurgents in a few countries such as Afghanistan).