It came as Ukraine claimed that it now controls 620 square miles of Russian territory.
Moscow initially said the strike was on a Ukrainian armoured column.
However, the Ka-52M Alligator helicopter actually hit its own side, according to Telegram channels.
The blunder by President Putin's forces is believed to have destroyed one 2S19M2 Msta-S self-propelled gun and damaged another.
The incident occurred in the area of the village of Krivitskiye Budy in the Belovsky district of the Kursk region.
The extent of casualties was not revealed. But Volta independent Telegram channel which monitors both sides said four armed vehicles were hit.
Esta historia es de la edición August 14, 2024 de Daily Express.
Comience su prueba gratuita de Magzter GOLD de 7 días para acceder a miles de historias premium seleccionadas y a más de 9,000 revistas y periódicos.
Ya eres suscriptor ? Conectar
Esta historia es de la edición August 14, 2024 de Daily Express.
Comience su prueba gratuita de Magzter GOLD de 7 días para acceder a miles de historias premium seleccionadas y a más de 9,000 revistas y periódicos.
Ya eres suscriptor? Conectar
IDEAL TONIC FOR ARTETA
Bug-hit Gunners roar back as quick double floors Bees
Pickford loving good old days
JORDAN SAVOURS THE GOODISON FAREWELL
The 12-minute workout that keeps Dame Helen looking fabulous at 79
DAME Helen Mirren says people on a new year health kick needn't splurge on gyms - she still swears by a 12-minute daily routine at home.
WILSON'S A WINNER FOR BLACK CATS
Sunderland home in on top
Kop that! Bunting weaves his magic
TITLE GLORY AND ANFIELD IN SIGHT
RAI HAS 'GREAT' SHOT AT CALL-UP
Donald says Aaron is on f right track for Ryder Cup
HENDO FINDS A GOOD PLACE
LUCKY PLACE impressed with a Relkeel Hurdle triumph at Cheltenham - and is now 10-1 (from 25-1) for the Stayers' Hurdle at the National Hunt Festival in March.
After years of treating my body badly, I now treat it well
Dylan Simkin, 49, had been overweight since his 20s and had a liver transplant in 2021. But after the op he hit 19 stone, so the maths tutor, from Atherstone, Warks, turned to his local Slimming World for help
Can Gen Z's new noise trend bring me calm?
Lying on a hard dance floor with just a thin mat and cushion under my knees for comfort, my back cannot get comfy and my hair gets stuck in my headphones.
'My secret for a long life? Don't get married!'
Kath reflects on love of freedom as she turns 103