US intelligence also assessed that the war in Ukraine has devastated the pre-war Russian military, although Russia has partially offset these losses and continues to prepare for a long war in Ukraine. 

The declassified intelligence assessment reportedly stated that Russian forces have lost 87 percent of the total number of their pre-war active-duty ground troops and two-thirds of the tanks in their inventory before February 24, 2022.

The declassified intelligence assessment reportedly stated that Russian forces lost 315,000 personnel out of the 360,000 personnel, 2,200 out of 3,500 tanks, and 4,400 out of 13,600 infantry fighting vehicles and armored personnel carriers that participated in the  full-scale invasion of Ukraine.

The assessment reportedly stated that Russian ground forces have lost over a quarter of their pre-invasion stockpiles of military equipment as of late November 2023, reducing the complexity and scale of Russian offensive operations in Ukraine.

The Russian leadership has undertaken extensive force generation measures to offset manpower losses, however, and Ukrainian intelligence reported in September 2023 that Russian forces had 420,000 personnel in occupied Ukraine.

Partial mobilization began in September 2022 and ongoing Russian crypto-mobilization efforts have very likely offset the Russian losses reported by US intelligence, although new Russian personnel likely have lower combat capabilities than those they replaced.

The Russian military command is also pursuing long-term restructuring and expansion efforts to form strategic reserves and prepare for a potential future large-scale conventional war against NATO, although short-to-medium-term manpower requirements in Ukraine are likely undermining these efforts.

Russia has been gradually mobilizing its defense industrial base (DIB) to address materiel losses in Ukraine and sustain a prolonged war effort, although there are no indications that Russia has made significant progress in offsetting armored vehicle losses in Ukraine.

Ukrainian President Volodymyr Zelensky stated on December 11 during a speech at the US National Defense University that Russian President Vladimir Putin is shifting the Russian economy and society to a war-time footing.