According to Kiev junta, Russian forces began their offensive on Kharkov.
Kharkov is the second largest city in Ukraine, culturaly and geographically close to Russia.
Russian military is silent about this for obvious reasons.
It's probably happening because there are rumors and talk of lots of civilians in that area moving or fleeing.
It's probably pretty likely the Russians will encircle and cut off Kharkov. I highly doubt that they will do a direct assault on the city itself it wouldn't make sense. Just do 2 pincer movements to cut it off and encircle it, wait it out for a period of time and tell them to surrender or fight to the death.
Kharkov is not bastogne. It won't hold out indefinitely. Patton isn't on his way.