Let's say Prince Paul doesn't maneuver the Kingdom of Yugoslavia into a neutral position in the Tripartite Pact but opts to enter the Second World War on the side of the Allied Powers. The Axis Invasion of Yugoslavia goes similarly to OTL which sees the Yugoslav government flee into exile with King Peter II and the few thousand men that accompany them to Egypt or Palestine. Paul remains behind to start establishing a pro-Yugoslav Chetnik resistance movement to the Axis occupational forces and leads those apart of the Royal Yugoslav Army who haven't surrendered into battle.
How would this play out? How successful would Paul be? What could this alt-Chetnik movement look like?
How would this play out? How successful would Paul be? What could this alt-Chetnik movement look like?