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This is good, if true.

Putin's forces may only be able to keep up the fight for another 14 days, defence sources say | Daily Mail Online
Putin's forces may only be able to keep up the fight for another 14 days, defence sources say | Daily Mail Online

While Russia might still be able to win the military conflict, it looks to me as though their strategy now depends on besieging Ukrainian cities in order to threaten to starve the population in the hope that that will force the Ukrainian government to make substantial concessions. 
If my interpretation of the situation is correct, Putin now knows that the invasion was a mistake. The problem is that saying so and withdrawing make him look very bad, possibly resulting in his fall from power. At the same time, if it becomes clear that Russia cannot win, that the most it can do is to destroy a lot more Ukrainian property and kill a lot more Ukrainians, Zelinsky will be reluctant to agree to any terms that make it look as though Russia had gained something by the invasion. That raises the question of whether there is any agreement that would let both sides claim to their own people to have won. 
Hence my suggested terms, conditional on its being reasonably clear that Russia cannot win a military victory:
Both sides agree to referenda in the Crimea and the Donbass region, conducted by a neutral party. If a majority in the Crimea vote to join Russia, Ukraine — and, presumably, other countries supporting it — agree to accept Russian annexation of Crimea. If a majority in Donbass vote for independence, Ukraine agrees to accept it. If, on the other hand, a majority in either region votes to be part of Ukraine, Russia agrees to accept that.
When the agreement is made, Putin can claim that of course Russia will win both referenda, hence getting the result it wants. Zelinsky can claim that he is agreeing not because of the Russian military threat but because Ukraine believes in democracy. The actual referendum happens after the Russian military has withdrawn from Ukraine, so if things don't go the way Putin wants he can complain that the referendum wasn't done properly but stop short of repeating the failed invasion. In fact, I expect Russia will win in Crimea, thus actually getting something it wants — international recognition of its seizure. 
What happens in Donbass partly depends on whether the referendum is for the whole province or only the parts that have been under Russian and secessionist control. That is a high stakes gamble for both sides. A referendum in the whole province might result in Ukraine losing territory it has been controlling — but also might result in Russia losing territory it has been controlling, since the rest of the province may not be enthusiastically pro-Russian, especially after being invaded. Whichever way the referendum goes happens after the Russian army has left Ukraine, unlikely to return any time soon.

https://www.youtube.com/watch?v=mXdzAZvid0E

https://www.youtube.com/watch?v=mXdzAZvid0E