how is that a problem?  you are random pleb. there is no money anywhere. you have 2 choices to get food: join army or work at the factory. this economy only needs foreign money to pay for foreign goods, which russia can get selling natural resources, which workers mine for food, which peasant farm from land for food. there are only 2 problems - army dont want to fight so whole scheme collapses, or there is not enough food. there is no hope for the first outcome, like literally there is a queue of foreigners to jump into the meat grinder for free, so what is to talk about native russians. second is hiiiighly unlikely, like what needs to happen for for farmland to produce much much less food (esp if we cut stupid crops and start minmaxing whole agrarian sector for war) and simultaneously prevent russia from importing food even if its own capability fails?
Ukraine