Really interesting maps to look at:
https://twitter.com/Horace_Badun/status/1501215344739995650
The bottom right map shows Ukrainian forces seizing land behind the invaders as they move inward (in the North of the country). They are hitting those supply lines. (blue areas getting behind the red areas)
Video of invaders surrendering:
https://www.reddit.com/r/ukraine/comments/t9jz30/surrendered_russian_troops_near_nikolaev/
Video of invaders dead (graphic):
https://www.reddit.com/r/ukraine/comments/t9iadv/nsfl_corpses_of_russian_special_forces_near/
Ukrainians seem to have a lot of air defense concentrated around Kiev, and if they have forces to mount a counter attack northwest of the city threatening Russian supply lines, I wonder what’s waiting for the Russians in Kiev itself.