Russia's parliament passed a law eliminating the age limit for those serving in the military on Wednesday.

Currently, Russians aged 18 through 40 can enlist in the military, though the new legislation removes the upper age limit.

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"Today, especially, we need to strengthen the armed forces and help the Ministry of Defence. Our Supreme Commander is doing everything to ensure that our armed forces win, and we need to help," State Duma speaker Vyacheslav Volodin said, according to Reuters.

The legislation still requires Russian President Vladimir Putin's signature before it goes into law.

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Though the exact number of Russian military casualties is unclear as its invasion of Ukraine drags on, the U.K. Ministry of Defense estimates the death toll is on par with "that experienced by the Soviet Union during its nine-year war in Afghanistan."

By that number, as many as 15,000 Russian soldiers might have died since the country began its war on Ukraine in February.