This impression was reinforced by buffer zones established by the JNA after fighting between Croatian Serb militia and the ZNG--the JNA often intervened after the ZNG had lost territory, leaving the Croatian Serbs in control of areas they had captured before the JNA stepped in.
This impression was reinforced by buffer zones. These buffer zones were established by the JNA after. These buffer zones were fighting between Croatian Serb militia. These buffer zones were fighting between the ZNG. The JNA often intervened. The ZNG had lost territory, leaving the Croatian Serbs in control of areas they had captured. The JNA stepped in.