"The latest estimates from the US intelligence community would be something in the vicinity of 15,000 killed and maybe three times that wounded," Burns was quoted as saying. "So a quite significant set of losses."
Speaking at the Aspen Security Forum in the western US state of Colorado on Wednesday, he added: "And, the Ukrainians have suffered as well - probably a little less than that. But, you know, significant casualties."
According to the latest official casualty figures from Moscow, 1,351 Russian soldiers had been killed in Ukraine by March 25, the Reuters news agency reported.
Abandoned corpses of Russian soldiers in Vilkkhivka, near Kharkiv, northeastern Ukraine, seen on Monday, May 9, 2022. Photo: PAP/Abaca/Diego Herrera Carcedo
Meanwhile, the government in Kyiv said last month that 100 to 200 Ukrainian troops were being killed per day in Russian President Vladimir Putin's war of aggression, according to Reuters.
According to the Ukrainian military, around 38,850 Russian soldiers have been "eliminated" since Putin invaded Ukraine in late February.
The Russians have also lost 1,704 tanks, 3,912 armored fighting vehicles, and 859 artillery systems, the General Staff of the Armed Forces of Ukraine said on Thursday, as cited by the ukrinform.net website.
Other Russian losses in Ukraine include 251 multiple launch rocket systems, 113 anti-aircraft warfare systems, 221 warplanes, 188 helicopters, 15 warships, and 710 unmanned aerial vehicles, ukrinform.net reported.
Thursday is day 148 of Russia's invasion of Ukraine.
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Source: IAR, PAP, ukrinform.net, Reuters