Falling back across the river actually makes sense. The Russians are having tremendous logistical issues, so holding the city might not have been possible. Add to that its the rainy season, making movement difficult (and the Russians haven't been very good at it so far even when it was dry), they might simply be waiting for the ground to freeze.
If this is an operational pause it gives them time to train the conscripts they called up, bring supplies forward, and get deliveries of fresh weapons from Iran and possibly others.
When they have reconstituted the Russian could attack over the river to the North of the city with the intention of threatening an envelopment that would cause the UKes to fall back.
Still, the Russians seem to lack the prowess to pull it off.
Pershing 1A. No city too big, no populated area too small. We even get the roaches.
