Apparently they withdrew from Izyum behind the Oskol river during the night. Unconfirmed reports are UAF crosses the Siversky Donets river largerly uncontested and are either fighting in or have already pushed the Russians out of Lyman.
All of this in the span of a few days without much resistance in crucial areas that took the allies months to take. No idea what to even say to this tbh.
We will see.