Negotiations between Russia and Ukraine unlikely at this time

 ISW:

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Ceasefire negotiations have effectively collapsed. Both Russian and Ukrainian officials are unprepared to engage in serious negotiations in the coming weeks in any format. Virtual negotiations are continuing without progress.[1] Kyiv and Moscow are both likely counting on the outcome of Russia’s offensive in eastern Ukraine to recalibrate their negotiating positions.

Kyiv is unlikely to accept a peace deal without Russian forces withdrawing to at minimum their pre-February 24 positions and likely hopes to further degrade the Russian military in eastern Ukraine and possibly retake Russian-occupied territory before reengaging with the Kremlin. Ukrainian presidential advisor Mykhailo Podolyak stated on April 9 that Ukraine is prepared to pay a high price for victory and that Ukrainian military victories in the east will provide substantial leverage to negotiate “powerful” security guarantees with the Kremlin. Podolyak and Ukrainian President Volodymyr Zelensky separately emphasized on April 11 that Ukraine is not prepared “to give up territory for peace.”[2] Ukrainian anger over Russian atrocities against Ukrainian civilians will additionally likely entrench Ukraine’s unwillingness to negotiate with the Kremlin.[3]

The Kremlin will likely stall negotiations until Russian forces redeploy from other axes to eastern Ukraine, hoping to translate any Russian military gains into leverage over Ukrainian negotiators. Putin said on April 12 that negotiations have reached an impasse.[4] Kremlin Spokesperson Dmitry Peskov said on April 8 that Russia could complete its invasion of Ukraine in the “foreseeable future.”[5] Russian forces will likely continue ongoing offensive operations in the Donbas region, feeding reinforcements into the fight as they become available rather than gathering reinforcements and replacements for a more coordinated and coherent offensive.[6] The Kremlin likely hopes to capture at minimum the entirety of Donetsk and Luhansk oblasts before resuming negotiations.
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Neither side has any incentive to negotiate at this point.  The Russians are losing this war but hope to force concessions with continued attack once their forces are reconstituted if ever.  Ukraine is not ready to cede any territory.  I suspect it will take months at least to get some semblance of reorganization.