Postwar, Fomenko continued to hold senior positions, ending his career as first deputy commander of the Northern Group of Forces in the late 1950s.

A Ukrainian, Sergey Stepanovich Fomenko was born on 7 October 1902 in the town of Shpola, Kiev Governorate.

He was promoted to the rank of kombrig on 17 February 1938, and in July of that year appointed deputy commander of the Transbaikal Military District.

Fomenko's army prepared reserves for the troops on the Eastern Front, while training to break through fortifications and fight in mountain and taiga conditions.

The units and formations of the army in the fall inspections displayed a high level of combat training.

[1] He was given command of the right (western) flank of the 36th Army, consisting of the 293rd and 298th Rifle Divisions supported by two machine gun artillery brigades.

The recommendation read:[7]General-leytenant Fomenko, during the battles with the Japanese, commanded an operational group of the troops of the army on the Manzhouli axis.

General-leytenant Fomenko, leading the fighting of the group, was directly with the combat formations of the advancing units, displaying an example of courage and heroism.

Fomenko transferred to serve as first deputy commander of the Northern Group of Forces in Poland in July 1956 before being retired in 1957.