They started the whole conflict out of a desire to expand their arbitrary lines in the sand to include ukrainian territory.

Why do you think Russia invaded, exactly ? they started the whole conflict after decades of making NATO encroachment along their borders a clear red line and being very clear what would happen if it was crossed

The US still kept meddling in Ukraine (and other post-soviet states), with Russia making every effort short of war to try and stop that - like offering loans just as large as the IMF loans for example, except without asking for the batshit insane austerity measures the latter did

Then the CIA backed a far-right coup there in 2014, and much of the following years were spent with NATO financing and training nazi soldiers there in preparation of trying to take back Crimea, while breaking the Minsk agreements in the meantime (I'll pass on the various atrocities and huge reframing of nazi criminals as national heroes in Ukraine there at the same period, since it's barely related, but it is worth a mention too)

Now both Ukrainian and Russian people are dying. A peace deal would stop that.