Previous: Peace Walker Battle 3
There is two ways to possibly find Zadornov;
A) Go to Banana Fruta De Oro: Sorting Shed.
B) Go to Rio Del Jade
He'll be hiding crouched in a building. Search all the buildings in the area, the top of the Boathouse is his most favored place in the Rio Del Jade area. Then play or replay another two Extra Ops missions to activate the next Main Op mission.