Because previous negotiations with Russia have led to exactly this? Every time the price will go up. By no one I mean Ukrainian people. Curious question would you agree to give up Slovenian sovereignty to Russia for peace?
There's been no indication that Russia is willing to give back the territory they've annexed so negotiations are a non-starter from a Ukrainian perspective.
Edit: And a deal with Russia isn't worth anything as we've seen.
We should know by now that negotiating with Russia is a waste of time as it's been proven time and time again during the history of mankind. Right now it only suits them, that's why they are talking louder and louder about it and I bet Ukraine will be forced to negotiate again because the last treaty between Russia and Ukraine worked really well...... There is simply no possibility of "de-escalating political tension" as long as Putin rules Russia, and most likely even after that.
Well there is already speculation by all of you that x and y will happen/been demanded.Because the Kremlin has shown time and time again that they are nothing but two-faced snakes. Have you seen what they did regarding the grain deal just the other day? How can anyone sane trust anything coming out of Putin or his minions whey they show zero respect for any deal? Russia ain't going to give back annexed lands unless they face into a situation similar to Germany's at the end of 1918 - a total collapse of the government.
My opinion is that if there is opportunity for negotiations it should be used and if there is no possiblity for good deal for both sides then of course don't accept the offer.
For example if the reports are truthful Ukraine is doing better and better and that gives them stronger base for negotiations which definitely should be used.