From "The Analyst":
TORETSK LOSSES
The Russians have found and exploited a Ukrainian weak spot in the front protecting Toretsk, south of Klieshievka, and an area that has barely altered in years - right back to the 2014-15 period.
It appears the Ukrainians had withdrawn a heavy presence and after months of probing up and down the front the Russians finally found a new weak spot.
Unfortunately they managed to advance extremely quickly, by as much as two kilometres in two prongs of attack.
Ukraine isn’t saying much about it yet but alarm bells are ringing.
Depending on the forces the Russians have available, they might not fully exploit it given their resources, but will certainly try.
However it’s also been noted that they have withdrawn a number of units from the Kharkiv front due to exhaustion - with no apparent replacement. They may well be switching their focus yet again.