Volodymyr Zelenskiy has said that some 43,000 Ukrainian soldiers have died since Russia began the all-out offensive.
In a post on social media, Ukraine’s president said 370,000 injuries had been reported, although that number included soldiers who were wounded more than once and some were described as minor.
He also claimed that 198,000 Russian soldiers were killed and another 550,000 wounded.
The BBC could not confirm the figures for either party.
Although both Kiev and Moscow have regularly published estimates of the other side’s losses, they have been reluctant to share their own details.
New figures indicate a significant increase in deaths in Ukraine since the beginning of the year.
The last time Zelenskiy gave an update on Ukraine’s casualties was in February, when he put the death toll at 31,000.
Incoming US President Donald Trump is believed to have written on social media that Ukraine had “ridiculously lost” 400,000 troops after nearly 600,000 Russians were killed or wounded, prompting the Ukrainian president to admit it. was forced to Trump did not say where the data came from.
The incoming president, who has long made it clear he wants the war to end, said too many lives had been “needlessly lost.”
Zelensky’s estimates of Russian losses are similar to those provided by senior Western officials, who estimate Russian casualties at around 800,000, both killed and wounded.
Britain’s Ministry of Defense says Russia suffered 45,680 casualties in November alone – the most in any month since its full-scale offensive began in February 2022.
An average of 1,523 Russian soldiers are being killed and wounded every day, according to the latest estimates from UK Defense Intelligence.
On November 28, it says, Russia lost more than 2,000 men in a single day, the first time this had happened.
Moscow disputes these figures. In a statement, the Kremlin claimed that Ukraine’s losses were “many times higher” than Russia’s.
Outside of Russia, the consensus is that Russian casualty figures There are more than Ukraine because of their “meat grinder” tactics..
Recent developments in the war have only increased the death toll.
Russian forces have continued to advance along the eastern front line since the start of the year, capturing about 2,350 square kilometers (907 square miles) of territory in eastern Ukraine and Russia’s western Kursk region since the start of the year.
Ukrainian forces have retained control of a small swath of Russia that was captured in a surprise attack in August.
The Russian Defense Ministry says more than 38,000 Ukrainian soldiers have been killed or wounded in Kursk alone – a number that cannot be verified.
Russia annexed Crimea in 2014. Eight years later, he launched a full-scale invasion of Ukraine and occupied the southern and eastern regions of the country.
Zielinski mentions the dead end of the war in Ukraine in a broader post about the prospect of an eventual end to the war.
It follows talks with French President Emmanuel Macron and Trump in Paris on Saturday, who sought to capitalize on the view of nearly a quarter of Americans that the US is providing too much aid to Ukraine.
During the campaign, Trump repeatedly said he could end the war between Russia and Ukraine “in one day” — but has not yet made clear how he plans to do so.
In his post, Zielinski stressed that any peace deal must be backed by effective international guarantees for his country’s security.
He said he told Macron and Trump that Kiev needs a “sustainable peace” that Moscow “will not destroy in a few years.”
In response to Trump’s call for an immediate ceasefire, the Kremlin said it was open to talks, but Russian President Vladimir Putin had set conditions for a ceasefire in June.
Their demands included giving up more of Ukraine’s territory and abandoning ambitions to join NATO, which Kiev has rejected.