The admission was in relation to the battle for the city of Bakhmut in Ukraine's eastern Donbas region.

Russia has been fighting fiercely to take back the city since last summer, and now appears to be pouring more manpower into the region to finish the job.

"They have been trying to take the city since July," Iryna Rybakova, press officer for Ukraine's 93rd Brigade, told BBC. "Little by little they are winning now. They have more resources, so if they play the long game they will win. I can't say how long it will take."

Moscow has established control of both main roads into the city, with only one back route left open, making it increasingly difficult to get supplies to Ukraine troops.

Ukraine President Volodymyr Zelensky's office also admitted that the turf war had become "difficult," while Donetsk Gov. Pavlo Kyrylenko said, "We're seeing a very tough battle in which the Russians aren't sparing neither themselves nor us."

As Chris Menahan notes, the statements contradict legacy media narratives that Russia is running out of weapons and supplies, which has been the dominant mantra since just after the start of the conflict.