If you are decent looking, and have some game, try the civvie route - Belgrade (to my pleasant surprise) has a very good looking female population. In fact, I was blown away by the sheer number and hotness of the 1000's of young girls I saw walking around the main street. It was hard to find a women who was un-shaggable. I used Tinder and snogged one woman and banged another. Both were around the 7.5 mark on the scale. Everyone knows English and the place is friendly. The city at first appears to be very grim and depressing, with little in the way of tourist attractions, but it is affordable, and I felt safe.
Enjoy :-)