Avoid Serbia, nothing there for your type of banking, especially for non-dom accounts, MNE is at least more EU oriented and welcoming.
In fairness, not much Banking left in Balkans, might sounds like a region that is not in EU so lets go there all private and easier, its not at all that way, due to not so good economy, Gov keeps everything under control to try and milk every cent of the taxes, so pressure on Banks to report, block, refuse any not so clear/gray transaction is very big. Need to take the political/economic issues into calculation a little before one does let the cash go to iffy Banks/Countries. Thats why a proper Corp Structure and a well know Bank will cost some money, but you can rest assured it has been done properly with proper Banks/introducers etc.