They're still not Officers' or Commander's swords. They're MOUNTED TROOPERS' swords. Cavalry was issued swords. Not belt fed machine guns, not SVT-40 semi auto rifles, not sniper rifles, not pocket battleships - SWORDS. Cossacks had their version, Dragoons had their version, etc. etc...
In places like the Second Ukrainian Front mounted infantry (ie. TROOPER) was indispensable. The Russians employed cavalry extensively - horses are easy to keep, cheap to feed and cover broken terrain better than pretty much any vehicle ever to mount a gun. A mounted soldier can cover miles in a day over ground that a tank or truck could not hope to cross at all.
The rifle was used for dismounted fighting. If you think it's easy to hit a man sized target off the back of a galloping horse with a bolt action rifle, you've seen too many cowboy movies. The Russians did not employ Cavalry like the Americans did. They did it like the Indians would have if they had thought of it first.
Mounted troops were used to patrol, scavenge and in flanking maneuvers. They hit flanks and supply lines while armor did the frontal attacking. Gallop through, chop up a few Germans, wheel about, repeat or dismount and use the rifles.
GOOGLE "Russian Cavalry Tactics". A little digging is necessary, but it's there. It's not like looking up "Mosin Nagant" and discovering your inner expert.