Russian forces have likely suffered a similar loss in three months of fighting in Ukraine as they did in nine years of war in Afghanistan, British defense officials said Monday.

Russia's high casualty rate was the result of a combination of "poor low-level tactics, limited air cover, a lack of flexibility, and a command approach which is prepared to reinforce failure and repeat mistakes," according to an intelligence update from the United Kingdom's Defense Ministry.

RUSSIAN DIPLOMAT RESIGNS OVER 'AGGRESSIVE WAR UNLEASHED BY PUTIN'

It is believed that Russia has lost 15,000 soldiers in Ukraine so far. The reported death count in the 1979-1989 war was also 15,000, with 35,000 people injured. Roughly 3,000 Ukrainian civilians have died as of May 2, according to the United Nations. However, the actual death rate of Ukrainians is likely thousands higher, according to Matilda Bogner, the head of the United Nations Human Rights Monitoring Mission in Ukraine.

"Overall, to date, we have corroborated 7,061 civilian casualties, with 3,381 killed and 3,680 injured across the country since the beginning of the armed attack by the Russian Federation. The actual figures are higher, and we are working to corroborate every single incident," Bogner said, according to Al Jazeera.

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The casualties continue to grow, even after the country redeployed its soldiers in Ukraine's Donbas region, the U.K.'s Defense Ministry said. As the casualties climb, the ministry said it expects the Russian public's dissatisfaction with the war will grow.

Tuesday will mark the third month since Russian President Vladimir Putin ordered his troops to invade Ukraine in February. More than 6.5 million civilians are believed to have left Ukraine, with nearly 8 million other people believed to have been displaced within the country, according to the United Nations High Commissioner for Refugees.