Russia has still lost soldiers. But the 80,000 figure was not the total number of soldiers Russia had available to them. It was just a subset of the soldiers they had at their disposal. 750,000 is most likely still not the total number of soldiers Russia has to pull from.
I guess the 80,000 should have been 90,000. Typo.
I guess the 80,000 should have been 90,000. Typo.