Demoralised Russian troops shocked at the sight of "so many corpses" begged to go home in intercepted calls from the frontline.
In the intercepted calls, soldiers said the war in Ukraine could last "months", despite Vladimir Putin saying it would be over in two weeks.
Another infantryman said his battalion did not have any food left, with troops raiding a nearby supermarket for supplies.
Ukrainian politician Anton Herashchenko, advisor at the Ministry of Internal Affairs, shared translations of the phone calls online.
It comes after captured Russian troops complained about being "deceived" by Putin in a string of videos released by Ukraine.
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In one intercepted conversation shared by Mr Herashchenko, a Russian soldier reportedly moans: "We have no aviation, no f***ing support, we are like cannon fodder."
According to the Sun, he added that he would "do anything to come back home... resign from the army, I don't give a f***".
The soldier revealed that his comrades were looking forward to the end of the war as fighting "for no reason" had "f***ed everyone up".
In another leaked recording, a Russian infantryman complained that his battalion was facing "massacres" and said his comrades were "shaking", "afraid" and refusing to fight.
A third soldier called his wife, it is claimed, and told her: " Russia itself attacked Ukraine, why I don't understand. We're definitely here until May, that's for certain."
He warned the war could drag on for a couple of years.
Another Russian fighter said he was being paid £40 a day - a relatively high wage in Russia - but said no-one cared about the money anymore.
He echoed other soldiers' wishes to quit the army and said his comrades were "sleeping in the street".
"We're running out of diesel fuel, ammunition level is low too. I don't know what the f*** we're going to do," he added.
Russian forces have lost 1,000 troops a-day to a ferocious defence from Ukrainian troops and defiant citizen warriors, according to official Ukrainian numbers.
The loss of 11,000 soldiers, sailors and airmen by day 11 of the invasion has been a massive blow to Moscow, which is now calling up reserves.
Defence experts usually calculate invading commanders usually need an advantage in numbers of around three to one to attack a defending force.
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In house to house combat in inner cities, which is what Moscow is attempting, this calculation can be as many as four to one needed.
It is estimated that Russia began the invasion with around 230,000 troops, in Belarus to the north, on the eastern flank and offshore in the Black Sea.
That is only a few thousand more than Ukraine ’s entire armed forces, it is believed, but the defenders were better-trained.
And by adopting a full-on assault offensive on towns and cities that are well defended by a well-motivated force the Russian troops are now mired in urban combat.
