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A previously elite brigade is now filled with poorly equipped recruits.
Yevgeny Prigozhin says ammunition he was promised has not arrived.
The "vintage vehicles" have been brought out of storage to help Vladimir Putin's faltering campaign.
"Brutal and low-tech fighting has come to characterise much of the war", the MoD said.
Jean-Claude Juncker said he trusted Putin – before "something changed inside" the Russian president.
Volodymyr Zelenskyy has warned the “situation is getting more and more difficult” as resistance to Russia's pounding continues.
Russian-controlled Mariupol is at least 80km from the frontline.
What will it take for the war to end?
You might remember it being famously used early in the war, which began exactly a year ago.
Experts explain how Russian President Vladimir Putin's decision to invade one year ago has had long-lasting effects on the continent.