Some 43,000 Ukrainian soldiers person been killed since Russia's penetration began, Volodymyr Zelensky has said successful a uncommon admittance of the grade of the nation's casualties.
In a station connected societal media, the Ukrainian president said 370,000 others had been injured, though this fig included soldiers who had been wounded much than once.
He besides claimed that 198,000 Russian soldiers had been killed and a further 550,000 wounded.
The BBC has not been capable to verify these claims.
Both Russia and Ukraine person often desisted from publishing casualty figures and are thought to underplay the existent costs of the conflict.
A caller study from quality bureau Reuters, quoting an unnamed US quality source, said the warfare had outgo Russia 315,000 dormant and injured troops - astir 90% of the fig it archetypal deployed erstwhile the struggle began.
Meanwhile, a New York Times study from August, which quoted US officials, enactment Ukraine's warfare dormant astatine 70,000 with up to 120,000 wounded.
Before Sunday, the past clip Zelensky had fixed an update connected Ukraine's casualty figures was successful February, erstwhile helium enactment Ukrainian deaths astatine 31,000.
The Ukrainian president is thought to person been compelled to marque his latest admittance aft incoming US president Donald Trump posted connected societal media that 600,000 Russians had been killed oregon wounded, portion the fig for Ukraine was 400,000. Trump did not authorities wherever these figures were from.
While estimates of the warfare dormant and injured vary, the statement is that Russian casualty figures are acold higher than Ukraine's owed to their "meat grinder" tactics.
Recent developments successful the warfare person lone added to the fig of dead.
Russian forces proceed to marque incremental advances on the eastbound beforehand line, capturing and retaking astir 2,350 sq km of territory (907 sq miles) successful eastbound Ukraine and successful Russia's occidental Kursk portion since the commencement of the year.
Ukrainian forces support power implicit a tiny magnitude of Russian territory aft launching a astonishment violative into Russia successful August.
The UK's defence ministry says that successful November, Russia suffered 45,680 casualties - much than during immoderate period since its full-scale penetration began successful February 2022.
According to the latest UK Defence Intelligence estimates, Russia is losing an mean of 1,523 men killed and wounded a day.
On 28 November, it says, Russia mislaid much than 2,000 men successful a azygous day, the archetypal clip this has happened.
These figures were based connected open-source material, sometimes cross-referenced with classified data, officials said.
Ukraine does not let its ain subject casualties to beryllium published, truthful determination are nary authoritative estimates covering the past fewer months.
The Russian defence ministry says much than 38,000 Ukrainian soldiers person been killed oregon wounded successful Kursk unsocial - a fig that cannot beryllium verified.
Russia annexed the Crimean peninsula successful 2014. Eight years later, it launched a full-scale penetration of Ukraine and has occupied territory successful the country's southbound and east.
Zelensky mentioned Ukraine's warfare dormant successful a broader station astir the prospects for an eventual extremity to the war.
It follows talks successful Paris connected Saturday with French President Emmanuel Macron and Trump. The US president-elect has said connected galore occasions that helium wants a speedy extremity to the war, playing connected the sentiment held by astir a 4th of Americans that the US is providing excessively overmuch enactment to Ukraine.
During the campaign, Trump repeatedly said helium could extremity the warfare betwixt Russia and Ukraine "in a day" - but has yet to specify however helium intends to bash so.
In his post, Zelensky stressed that immoderate bid woody had to beryllium backed by effectual planetary guarantees for his country's security.
He said helium told Macron and Trump that Kyiv needs an "enduring peace" that Moscow would not "destroy successful a fewer years".