A former member of the UDF himself, Sofianski left the party following its fall from power after the June 2001 general election to form his own party, the Union of Free Democrats.
Sofijanski, i sam bivši član UDS-a, napustio je stranku nakon što je izgubila vlast na opštim izborima u junu 2001, i formirao sopstvenu partiju, Uniju slobodnih demokrata.