https://www.msn.com/en-us/news/world/big-changes-in-ukraine-s-army-why-zelenskyy-is-replacing-top-commanders/ar-AA1GNPNU

The major changes to Ukrainian military command has occured! Many commanders who have been failing have been replaced. Chief of the Staff Syrski has not been replaced.
This is why Russia cant beat Ukraine. Ukraine replaces commanders that fail - Russia keeps them around!