“The spear is pointed directly at Kup’yars’k - come within 10k and its effectively over for the entire Russian supply chain in Ukraine.”
Seems like they have already gotten that close.
Russia has to try to counter-attack.
Ukraine has to expand/secure that new salient, and jump some Artillery forward.
This was a big, bold move by the Ukrainian forces.
Russian have no troops close - they are all tied up in Izyum. Take away there, and another salient forms into Russian lines - they can’t win it seems.