The Russians are making a cakewalk of it. From Tyler Durden at zerohedge.com:
For the first time since Russia launched its major cross-border offensive into Ukraine’s Kharkiv region (it began last Friday), Ukraine’s government has acknowledged that Moscow forces have made rapid gains.
Oleg Sinegubov, the head of the military administration of the Kharkov Region, has said Russia is pushing past the frontline. “Essentially, the frontline is expanding as the enemy is advancing from multiple positions,” he admitted during an interview with Sky News.

Sinegubov blamed the delay in Western arms reaching frontline positions, explaining that “We feel it, and our soldiers on the battlefield feel it. We have been conducting a defensive operation for practically six months, awaiting new supplies. And, of course, the enemy outweighs us in armaments – not in quality but in quantity.”
This assessment of Ukrainian lines collapsing in Kharkiv region is consistent with the latest Kremlin statements:
Russia’s Defense Ministry said Sunday that its forces had captured four more villages in Ukraine’s Kharkiv region as thousands of residents were evacuated amid Moscow’s surprise ground offensive.
The ministry said its forces had “advanced deeply into the enemy defenses” and taken villages including Gatishche, Krasnoye, Morokhovets, and Oleinikovo.