This definition appears very rarely
Samples in periodicals archive:
From 1992 to 2010, the Armed Forces maintained a diminishing number of former Soviet Armed Forces districts – Leningrad Military District, Moscow Military District, Volga-Urals Military District.
Volga Military District and Urals Military District was merged in Volga-Urals Military District.
Born 23 September 1953 in Panskoye, Kursk region, Alexey Maslov was educated at Kharkov Tank Command School. Upon graduation in 1974 he reported to the then Carpathians Military District as junior leader. In 1984, he earned a degree at Tank Academy and was appointed as regiment commander (1986) and, later, deputy division commander within the Central Forces. From 1990 to 1994, Mr. Maslov served as deputy division commander, Volga-Urals Military District.