Country: Serbia, Bosnia and Herzegovina. On digitalpoints.com he claims his USA residency.
Most probably, he does not have Adsense account and use RevenueHits, PropellerAds and similar.
PayPal is not allowed/restricted in Serbia, so Nikola Milivojac uses MoneyGram, Bank wire, Western Union, UK Forex, and Escrow.
Accounts:
https://www.digitalpoint.com/members/milivojac.526218/
https://plus.google.com/+NikolaMilivojac/posts
Multiple accounts on Flippa.com
https://flippa.com/users/810400
https://flippa.com/users/817562
https://flippa.com/users/802998
https://flippa.com/users/834055
https://flippa.com/users/763698
Manager of a night club, you can find faces there that match Flippa accounts’ pictures