That's kind of the point. Saddle Ukraine with enough unsustainable debt that the West owns Ukraine forever.
It's kind of like that book "Confessions of an Economic Hitman" where the author talks about bribing Latin American governments to do the bidding of the USA, mainly selling oil, lucrative construction/energy/rebuilding contracts, etc. If they take the bribe, the government becomes indebted to the International Monetary Fund and becomes America's bitch. If they don't take the bribe, assassinations and "regime change"
Obviously Ukraine will have to pay for all these Western tanks, planes, and ammo, even if they lose. Sooner or later "Slava Ukraini" will be trademarked by Disneyland, and Kiev will be sponsored by JP Morgan Chase, McDonald's, and Onlyfans. Native Ukrainians would be unwilling to pay the war debt and would just flee, if they haven't already. Ironically Ukraine would retain more of its native culture if it surrendered to Russia.