Progress has been costly and staggered, but Ukrainian forces announced they had pushed through key Russian defensive lines with the capture of Robotyne in the Zaporizhzhia region this week.
"Having entrenched on the flanks of Robotyne, we are opening the way to Tokmak and, eventually, Melitopol and the administrative border with Crimea," Ukrainian Foreign Minister Dmytro Kuleba said during an earlier visit to Paris.
Tokmak appears to be the key ...
https://www.japantimes.co.jp/news/2023/08/31/world/ukraine-southern-gains/
I'm trying to be objective here. Hate to say it but Ukraine will run out of troops before they reach Crimea.