The phrase in this context most likely refers to the Z-4 Plan (officially titled "Draft Agreement on the Krajina, Slavonia, Southern Baranja and Western Sirmium"). The Z-4 Plan (Draft Agreement)
Following the failure of diplomatic drafts like the Z-4 Plan, Croatia launched in August 1995. This military offensive quickly dismantled the RSK, leading to the reintegration of the Krajina region into Croatia and the mass displacement of an estimated 200,000 Serbs. Krajina
The draft was ultimately rejected. The RSK leadership refused to even receive the document until they secured a commitment that UN peacekeepers would stay, while the Croatian government preferred a military solution to regain its territory. Historical Outcome The phrase in this context most likely refers
Despite the autonomy, the territory would remain under the internationally recognized sovereignty of the Republic of Croatia. The draft was ultimately rejected