A proper analysis would account for the active male population necessary for capitulation due to severe economic degradation.Your economy will reach a breaking point much sooner with incremental decreases in the working population. Who will farm the food? Drive the trucks? Maintain the utilities. Ukraine has and needs over 256,000 to maintain its utilities alone. The fact that millions already left the country is the nation's by far the biggest economic damage. Its telling that the biggest refugee recipient is Russia. Plus there is a good fraction of the population that is for the Russian side, even fighting for it and has or planning to move to it. Do not forget the DPR and LPR are Ukrainians fighting a civil war.
France in WW1 had a comparable population (40M) and lost 10% of active male population (1.3 Million male deaths) and still kept on fighting.
At the current Ukrainian death rate loss of 60-70K per 9 months, and Ukrainian population of 30M, it would take 12.2 Years to match WW1- French-level deaths, and they will keep on fighting.
So in conclusion, any strategy predicated on the aspirational capitulation of Ukraine based on attrition of lives/economic activity alone is a losing strategy, and mathematically doesn't hold up. You are much more likely to be successful if you just conquer the damn country, than to attrite it to surrender via economic collapse.