The current decline is due to a "wide variety of factors," Western officials told Sky News on the condition of anonymity. These include production and transport difficulties, along with Ukrainian drone strikes against ammunition depots. Shipments of Western ammunition supplies have also helped Ukraine level out the disparity.Russia is still finding other ways to maintain fighting power, officials said, pointing to Russia's increased use of glide bombs.There has been a "massive increase in Russian glide bomb use on the front line to devastating effect," one official said.Ammunition shortages have plagued Ukraine over the course of Russia's full-scale invasion. The EU failed to deliver on its promise to produce 1 million artillery shells between March 2023 and 2024 while political disputes in Washington led to a severe delay in a $61 billion aid package.