Interpol? Interpol acts like a liaison between different country's police. They don't really investigate anything. They just get information on criminals from other investigating bodies and send that information to others. You'd have to go to your local police, tell them about Sovu (Or whoever) and then that police would contact interpol and tell them about their active investigation. At which point, when he is picked up in Swaziland or whatever, Interpol is notified and they hand him over to your local police.
You might be watching too many TV shows of Interpol flying around making arrests.
From Interpol's FAQ:
"How do I report a crime to INTERPOL?"
"If you have information about a crime being planned or that has been committed, or if you are the victim of a crime, you should report this to your local or national police authorities. They can then access the appropriate INTERPOL channels if required. The INTERPOL General Secretariat can deal only with information provided by the appropriate law enforcement agencies, not members of the public."
My friend you might be in over your head here. I won't walk up to big bad Mr. Interpol and cry that Mr. Sovu ("or whoever", you know him personally as far as I understood from your posts on ecointalk, so your reply here is no surprise) stole my ice cream. But I'm sure they are interested in Sovu's shenannigans and avoidance of prosecution in Romania. How I do that really isn't your business, I thank you however, for this oh so valuable lesson about operating procedures of Interpol, I'm truly impressed by your knowledge and google-fu >tips fedora. If I hadn't been lectured by your superior intellect, I might've made a fool out of myself, golly gee. Sarcasm aside, I'm pretty confident, that I know a tiny bit more about law in general, international law, conflicts of jurisdiction and international litigation of civil and criminal law than you do Mr. Jumbley, so put a sock in it. You might be able to pull off your BS on ecointalk, screwing people over for your friend in Reading, it ain't that easy here.
So all the while I'll keep on watching too many TV shows of Interpol flying around making arrests, you my friend can go right back sucking BA's dick, since you got your X-3 nice and cozy in your home already (or on ebay by now, guess that's fine too). Gee, I wonder if that connection to Alex helped with your place in the queue...
edit: just so people know who they're dealing with here and that you're all cuddley with Mr. Alex the scammer, how's that for a cookie
http://i.imgur.com/HbbufbC.jpg