Its to fight the new conscripted russian army in day 464 of Putin's invasion of Ukraine.
Russian President Vladimir Putin declared a "partial mobilization" of Russia's armed forces on Wednesday morning — signing a decree that will send Russians who have gone through military training to join the fight in Ukraine while stopping short of an all-out draft. Sept. 21, 2022.
https://www.npr.org/2022/09/21/1124215514/putin-announces-a-partial-military-mobilization-for-russian-citizens
But this makes no sense. The Ukie army was victorious, with minimal casualties and highly successful at destroying Russian equipment. Just resupply them and let them move on to their next victory.