40% destroyed tanks is the visually confirmed ones. There's a lot of undocumented Russian losses, either from enemy fires or used as cannibalized spares for other tanks.
And the US only spend like 5% of it's yearly budget to reduce Russian conventional military by half.
The cost-benefit analysis of US support for Ukraine is incontrovertible. It’s producing wins at almost every level.
cepa.org
And there's people here and there that actually believes that Russia still has its " real army " in Russia waiting for NATO.