If you or your proxy is going to fight a war, somebody has to provide all those bullets, bombs, etc. From Alex Vershinin at rusi.org:
Can the West still provide the arsenal of democracy?
The war in Ukraine has proven that the age of industrial warfare is still here. The massive consumption of equipment, vehicles and ammunition requires a large-scale industrial base for resupply – quantity still has a quality of its own. The mass scale combat has pitted 250,000 Ukrainian soldiers, together with 450,000 recently mobilised citizen soldiers against about 200,000 Russian and separatist troops. The effort to arm, feed and supply these armies is a monumental task. Ammunition resupply is particularly onerous. For Ukraine, compounding this task are Russian deep fires capabilities, which target Ukrainian military industry and transportation networks throughout the depth of the country. The Russian army has also suffered from Ukrainian cross-border attacks and acts of sabotage, but at a smaller scale. The rate of ammunition and equipment consumption in Ukraine can only be sustained by a large-scale industrial base.
This reality should be a concrete warning to Western countries, who have scaled down military industrial capacity and sacrificed scale and effectiveness for efficiency. This strategy relies on flawed assumptions about the future of war, and has been influenced by both the bureaucratic culture in Western governments and the legacy of low-intensity conflicts. Currently, the West may not have the industrial capacity to fight a large-scale war. If the US government is planning to once again become the arsenal of democracy, then the existing capabilities of the US military-industrial base and the core assumptions that have driven its development need to be re-examined.