Marking on cossack sabre

[Yustas]

Can someone identify the initials / markings on the picture.
Apparently it is a kozak's sabre.

[Jim McDougall]

Yustas, could we see a picture of the entire sword. It helps to have context.
The marking looks very much like a European cypher known as a ligature, three entwined initials often topped by a crown. This seems primarily 18th century affectation, and if on a Cossack sword may be a heirloom or award blade.

All best regards,
Jim