The Russians report the long-awaited Ukrainian offensive has finally begun.

Ukrainian forces have attacked the Russian troops along five sections of the frontline in Donbass during their “large-scale offensive,” the Russian Defense Ministry said in the early hours of Monday. According to the MOD, the assault began on Sunday morning. “The enemy’s goal was to breach our defenses in what they assumed was the most vulnerable section of the frontline,” the ministry said in a statement carried by the Russian media.

It will be interesting to see the shape of the Russian response. As I was discussing with William S. Lind the other day, the historical Russian response has been to launch a counteroffensive with far more forces than had been anticipated. That may not be possible anymore in the day of satellite flyovers, but it’s worth noting for the record.