A Rusland Hilfswillige Soldaten using a Soviet PPSch-41 submachine gun, Army Group North, Soviet Union; 1943
A Rusland Hilfswillige Soldaten is a Russian who joined the German army and fought for them, hence his cap, and his ammunition pouch (which appears is German and not Russian).
This photo is titled:
“Kosaken-Kavallerie-Division mit sowjetischer Maschinenpistole PPSch-41 im Anschlag im Wald hinter einem Baum stehend, in Schießbereitschaft; PK 693”.
Translated: A Kossack Cavalry Division with a Soviet submachine gun PPSCH-41 standing, ready to fire, behind a tree.