A negotiated peace in Ukraine

Ukraine appears to be fighting back against a superpower in a manner that few expected possible, possibly even the people of Ukraine themselves.

Yesterday, I snapped at my mother when she had talked about how a negotiated settlement to the conflict in Ukraine should take place.  Part of my annoyance is because there is to be a Stop The War meeting later this month were people are to discuss how the war should end.  Many blame NATO expansion for this war, but forget how Russia has invaded other nations before this, Russian troops continuing to occupy Transnistria (‘92), Abkhazia (‘93), South Ossetia (‘08), also the way it invaded and annexed Crimea and the conflict the Donetsk and Luhansk regions of Ukraine which resulted in Russia accidentally destroying MH17.  Those in the Baltic states are nervous of Russia and have joined NATO to prevent what happened to Moldova happening to them.   

Before this war, in the build up to it, the intention of Russia to annex both Luhansk and Donetsk was discussed in a socially distanced meeting with Putin, though he denied that this was to happen, referenda into this were planned and have now been delayed.  

The irony of course is that the Stop the War meeting would be banned in Russia, Transnistria, Abkhazia, South Ossetia and Russian occupied Ukraine.

So my question to those who want a negotiated peace, is should this involve Russia keeping the parts of Ukraine it occupied in 2014, or should more of Ukraine be given to Russia now?