Because Ukraine has effectively no negotiating power in this war without US support. They rely very heavily on the armaments provided by the United States over the last few years. If that support were to stop, the war would be over tomorrow, and Zelensky has said as much already.

I still think you’re right that the Ukraine should be the ones doing the negotiations though.

Honestly, wherever these images come from, if they were posted every day it would probably help visibility of what they actually DO.