If you're looking for a meeting place or a good stop around ½ or halfway between Sajkas and Krusevac, you can try Lozovik, Serbia, which is about 1½ hours southeast of Sajkas, or a little over 1 hour north of Krusevac.
Another possible place to stop near the midpoint is Radinac.
About ¼ or a fourth of the way, you can stop at Belgrade, Serbia. This is almost an hour southeast of Sajkas.
About ⅓ or a third of the way, you can stop at Kaluderica, Serbia. This is almost an hour southeast of Sajkas.
About ⅔ or two thirds of the way, you can stop at Svilajnac, Serbia. This is about 2 hours southeast of Sajkas, or almost an hour north of Krusevac.
About ¾ or three fourths of the way, you can stop at Jagodina, Serbia. This is a little over 2 hours southeast of Sajkas, or almost an hour north of Krusevac.
If you drive straight through without stopping at all, the total distance is 270 km. The distances shown above don't include local roads to get into each town, so if you're planning a long road trip, make sure you factor in traffic and road conditions, rest stop breaks, and interesting detours along the way. If you're in a rush, you can do the trip with zero stops, and your total travel time would be around 2 hours, 54 minutes.