It came when British intelligence reports said that more than a quarter of the Russian combat troops used in the invasion are now "ineffective".
Some of the most elitist units Moscow, including the air landing forces, suffered the highest wear and tear in the first 68 days of the conflict.
The Ministry of Defense said that it would "probably take years before Russia has rebuilt these forces".
The Kremlin, according to the report, sent over 120 tactical battalion groups with 600 to 1,000 soldiers each to Ukraine, which makes up for about 65 percent of the total ground combat strength.
In a Ukrainian attack on a Russian command center in Izyum on Saturday evening, around 200 invading troops were killed, including the ninth Russian general who died in the conflict.
Kiev said that his resistance employees had killed General major Andrei Simonov, 55, a high -ranking commander of the electronic warfare, with an artillery attack near the northeastern city.
Oleksiy Arestovych, a consultant by President Wolodymyr Selenskyj, said that the strike also destroyed around 30 Russian armored vehicles.
Film material published online seemed to show how the command post of grade missiles was hit, which were fired by a rocket system with several starts.
Viktor Andrusov, a consultant by the Ukrainian Minister of the Interior, said he could not confirm reports that General Valery Gerasimov, the head of the Russian armed forces, was also killed in the attack.
"We have confirmation that he was really there, in the area of Izyum, but we have no confirmation that he was injured. In addition, we already have a safe confirmation that he was not injured," said Mr. Andrusov.
In the run -up to the attack, Western official said that they had received "credible reports". General Gerasimov was sent to the front by Wladimir Putin to monitor the advance to conquer Eastern Ukraine.
The streets gradually and from Izyum, which is considered a gateway to the eastern Donbass region of Ukraine, are of crucial strategic importance for the Russian armed forces.
Moscow used Belgorod, which is located directly within its border, as a logistical turntable for his war effort. There is a direct road from the city to Izyum, part of the Charkiw.
region
The Russian military has been stuck
The Kremlin recently shifted the focus of his invasion in Ukraine to conquer the eastern Donbass region.
But the renewed military campaign was slowed down, stuck through muddy conditions and violent Ukrainian resistance.
The Kiev armed forces have succeeded in interrupting the Russian supply chains by freed cities around Charkiw, the second largest city in Ukraine and the closest at the border with Russia.
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