Not the Nikov you were searching for? Then you must've been looking for the other Nikov.
Nikov is a minor character of Ginga Densetsu Weed in the Russian Arc.
He is a member of the Russian Army, working under Major Victor.
He was guarding Jerome with Ivan. After Jerome escaped, Nikov, Ivan and Lydia tried to look for him but with no luck. Nikov and Ivan were afraid of their punishment, but Lydia defended them.
The picture displayed above could be either Nikov or Ivan.