Russian forces appear close to making significant gains in eastern Ukraine while Kyiv prepares for a possible new offensive from their north:
As battles rage, Russia likely controls Ukraine’s Soledar: UK
https://www.aljazeera.com/news/2023/1/10/russian-forces-likely-control-soledar-british-defence-ministry
I wouldn't call that a serious gain. Not compared to the serious Ukrainian gains of during the last 8 months around Kharkiv and Kherson. Russia has been totally done with large gains of territory since April. Since then, they have been grimly hanging on, with very small gains on small sections here or there, with occasional much larger collapses of a front. Since April, their territorial gains have been much smaller than the Ukrainian gains. Half the territory that Russia seized in 2022 has already been taken back by Ukraine. The tide is clearly going against Russia.
Saying Russia has some loses, but also some gains, implying it's going back and forth, is like saying Germany in 1944/1945 had some loses, but also some gains. The German advances in 1944/1944, counter attacks in Eastern Prussia, counter attacks in the Battle of the Bulge, were totally eclipsed by the huge Soviet and Western Allies advances during that period. By more than a 100 to 1 ratio.
I get the impression that this winter is so mild, for Ukraine, that significant advances by either side will be unlikely until May or June, with both sides being bogged down by the mud. But I think that before the summer is out, Russia will lose the Crimea land bridge and Crimea itself. We shall see.
Can Putin survive the lose of Crimea? That is, stay in office? Or even survive? I doubt it. Makes no difference. He will be replaced by someone just as bad. But able to rally the Russians to go on any further large adventures? I doubt it.