In January 1992, the Vance Plan proclaimed UN controlled (UNPA) zones for Serbs in territory claimed by Serbian rebels as the self-proclaimed proto-state Republic of Serbian Krajina (RSK) and brought an end to major military operations, though sporadic artillery attacks on Croatian cities and occasional intrusions of Croatian forces into UNPA zones continued until 1995. The fighting in Croatia ended in mid-1995, after Operation Flash and Operation Storm. At the end of these operations, Croatia had reclaimed all of its territory except the UNPA Sector East portion of Slavonia, bordering Serbia. Most of the Serb population in the reclaimed areas became refugees. The areas of "Sector East", unaffected by the Croatian military operations, came under UN administration (UNTAES), and were reintegrated to Croatia in 1998 under the terms of the Erdut Agreement.