Ukraine

In June 2024, Putin insisted Ukraine must withdraw from the four partially occupied regions — Donetsk, Luhansk, Kherson, and Zaporizhzhia — as a precondition for negotiations.

https://kyivindependent.com/putin-unwilling-to-compromise-in-peace-talks-setting-maximalist-demands/

"Precondition for negotiations" - meaning they wont even come to the talks if that hasnt already been agreed on.
Thats what they said, I'm just not sure thats what the US is insisting that Ukraine does. From Rubio's statements an "immediate full ceasefire" doesn't have any preconditions for movement of forces.