Work remotely for a US/UK firm, or a the local branch of a multinational, e.g. Microsoft's Serbian Subsidiary.

Lot of IBM jobs in Eastern Europe that require English and the local language. If you've got one and enough of the other to hold a conversation you've got a shot.

Yeah, most lucrative being IT and considering the low cost of living in Eastern Europe it could be quite a deal if one is to have a wild experience as people are friendly and such but local authorities are corrupted.

without the language would be very difficult IMO, also having "gambling" money for your own projects can help. what worked for me was try to bring foreign investors to the economy, make deal with start-up incubators, accelerators, etc. Talk to people who already do business there (expat scene is usually small). Connect with professors at local university, start teaching niche subjects you're an expert in. Ultimate goal isn't to make a boatload of money but to learn, not get ripped off, and hope you can exit the situation/business undamaged.

my experience is that ultimately all opportunities will remain hidden until I actually go there.