Russia struggling to replace ammo expended in Ukraine

 ISW:

...

The Kremlin is continuing efforts to covertly acquire munitions for use in Ukraine to mitigate the effects of international sanctions and backfill Russia’s ongoing depletion of domestic munitions stockpiles. British outlet Sky News reported on November 8 that the Kremlin flew 140 million euros in cash and a selection of captured British-made NLAW anti-tank missiles, US-made Javelin anti-tank missiles, and a Stinger anti-aircraft missile to Tehran on August 20 in exchange for 160 additional Shahed-136 drones for use in Ukraine.[5] The Ukrainian Resistance Center reported on November 8 that Tehran continues to supply Moscow with Mohajer, Arash, and Shahed-type drones by air and sea via both Iranian state-owned and privately-owned entities.[6] The Ukrainian Resistance Center additionally reported that due to failures of the Russian military-industrial complex, Russian military leaders are continuing their efforts to procure dual-use (military and non-military use) goods such as computer chips, quadcopters, night vision devices, and bulletproof vests from Turkey and are using cryptocurrency transactions to avoid purchase tracking.[7] Taken in tandem, these reports indicate that the Kremlin seeks to circumvent sanctions by engaging in quid-pro-quo and under-the-table negotiations with foreign actors.

...

Russia is now relying on rogue states like Iran for weapons while its own troops complain about the quality of what they are being forced to use from the Russian stockpile.

Russia is also dealing with the financial draine of the war:

...

The disproportionate financial burden of Russian force generation efforts continues to fall primarily on Russian regional governments’ budgets rather than the federal budget, prompting public backlash. Russian-language outlet Important Stories reported on November 7 that Russian federal subjects have spent 12.8 billion rubles (roughly 210 million USD) to pay mobilized personnel, but that most federal subjects did not allocate enough money to distribute promised one-time enlistment bonus payments.[47] The lack of payments has sparked protests in the Chuvash Republic and Chelyabinsk Oblast, as ISW has previously reported.[48] Public backlash and local protests prompted Russian officials from Perm Krai, the Chuvashia Republic, Omsk Oblast, and Russian-occupied Sevastopol to announce that they will distribute payments. Regional heads blamed incomplete records of mobilized personnel and implied that they always intended to provide the payments, which will likely strain local budgets.[49]

Financial and bureaucratic issues are continuing to hinder Russian efforts to replenish formerly elite units defending critical areas of the front line, potentially threatening the integrity of Russian defenses in occupied parts of Ukraine. A Russian source claimed that a St. Petersburg volunteer for the 76th Guards Airborne Assault Division, a formerly elite unit, was registered as a mobilized soldier rather than a volunteer, thereby only entitling him to a 50,000-ruble payment rather than the 100,000-ruble payment for volunteers.[50] The source also claimed that nine other volunteers of the division were similarly mislabeled.[51] The 76th Airborne Division is currently defending the front line in Kherson Oblast, where Russian forces desperately need more bodies who are willing to fight or provide cover during a controlled withdrawal.[52]
...

The war is exposing Russia's military and now financial drains as a result of the sanction regime and their own economic failure.