Both Kyiv and Moscow shroud their causality counts in secrecy, due to the effects they can have on army morale, populations at home and how the war is perceived abroad.

Writing on X, the UK MoD said the mounting Russian casualties reflect Moscow's "commitment to mass and attritional warfare."

"Although costly in terms of human life, the resulting effect has increased the pressure on Ukraine's position across the frontline," it added.

In February, Russian forces captured the Ukrainian town of Adviivka - their biggest gain in many months - after one of the most intense battles of the war.

Russia's Defence Ministry said its troops advanced some 9 kilometres and would press forward after the deadly urban battle in the eastern Donetsk region.

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