Nikita Syusyukalov served as a volunteer in the Spanish Civil War.
In Spain he served in the 1^a Escuadrilla of 26 Gruppo de Caza flying the Polikarpov I-15.

In August 1937, he claimed a shared destroyed Do17 near Zaragoza together with Leytenant Yevgenii Stepanov.

On 24 August he claimed a shared Junkers.

It is possible that both Syusyukalov's claims are the same.

Syusyukalov ended the war with two shared biplane victories, both claims while flying the Polikarpov I-15 during the Spanish Civil War.

Claims:

Kill no.	Date	Time	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1937
	??/08/37		½	Do17	Shared destroyed	I-15		near Zaragoza	1a/Gr. 26
	24/08/37		½	Junkers	Shared destroyed	I-15		Spain	1a/Gr. 26

Biplane victories: 2 shared destroyed.
TOTAL: 2 shared destroyed.

Sources:
Soviet Fighter On Three Fronts - John Guttman, 1995 Aviation History
Stalin's Falcons - Tomas Polak and Christhoper Shores, 1999 Grub Street, London, ISBN 1-902304-01-2
The Legion Condor - Karl Ries and Hans Ring, 1992 Schiffer Publishing, ISBN 0-88740-339-5
Additional information kindly provided by Ondrej Repka.