Ukraine sent a thousand men in.
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correction: 75,000
The 75,000 you mentioned were not the initial assault. They were the followup troops on the everwidening area of control.
The assault was narrow and is now proceeding on three roads in Patton like haste. The center assault seems to be heading to a nuclear plant. It was within about 25 KM yesterday and I don’t know about now
The forces are proceeding rapidly as were the Wagner force down south earlier.