[Mediterraneo10]

> Most likely Albania - Kosovo - Serbia route, since it's already established heroin smuggling route.

I assume this would require the smuggler to either be a Serbian or Kosovo citizen, or make a handover to a local person in Kosovo? A citizen of a third country cannot enter Serbia after entering Kosovo from a third country. The Serbian authorities will deny you entry and tell you to go back and enter into Serbia from one of the other countries bordering it.

[nradov]

Well that's how it works in theory. In practice the smuggler can sneak across the border or bribe the authorities, just like in every other country.