 Complete the following phrase:  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 