An important development: Russia forces at Lyman were either encircled and trapped or retreated, depending on the source. The Ukrainian Ministry of Defense said that virtually all Russians were captured or killed. I’m not aware of any independent confirmation of that, but there is enough evidence on social media to be sure that Russia took one on the nose.
This is a major tactic and strategic loss for Russia. At least in the east, Russia can no longer defend its major logistics centers against determined Ukrainian forces. Russian social media and milbloggers are in full meltdown mode. Accusations are flying everywhere.