In June 1941, Yachmenev served as the commander of the 92 IAP. This unit was at the time based at an airfield near Brody.

On 22 June 1941, he flew five sorties during the day.
During these sorties, he claimed one Heinkel and one Messerschmitt before being wounded during the last sortie and taken to hospital.

Yachmenev ended the war with 2 biplane victories.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1941
1	22/06/41		1	Heinkel	Destroyed	I-153		Brody area	92 IAP
2	22/06/41		1	Messerschmitt	Destroyed	I-153		Brody area	92 IAP

Biplane victories: 2 destroyed.
TOTAL: 2 destroyed.

Sources:
Triumf a tragedie - Milos Sedivy and Valerii Dymich, 2001 Svet kridel, ISBN-80-85280-70-1 kindly provided by Tomáš Polák