This is something along the lines of what I was thinking earlier. The more military and financial aid we provide to Ukraine to cripple and destroy the Russian military, the less of a threat they will be for years and years to come. Yes it's a big sum of money up front but over the long term, the savings could be quite significant.
How long will it take Russia to replenish and rebuild all these BTGs, aircraft, support vehicles, etc? Especially if sanctions remain in place.