A few hundred Bradleys and Abrams, weapons systems that were designed to murder soviets, which we built by the thousands, in the hope that we could defend Europe from an invasion it turns out wasn't ever likely to happen.
Those machines are not fit for a war with China, which is our current fear, and have to be replaced anyway. It literally costs obscene amounts of money to scrap and disarm them, but it turns out it's very cheap to let them save a few Ukrainian lives.
Nearly every dollar "spent" for Ukraine was either spent in the 80s military build up or is loaned to Ukraine so they can purchase our stuff.