Can the United States Sell Weapons to Ukrane?

Could you sell cibr warfare as a service? As a service? Here's what i mean by that. And it doesn't have to do the united states, It could be an ally. It could be israel. Say to ukraine, we will sell you the services, but you can have the tools. We'll keep the tools. But whatever happens after they push the button goes through the cibre warfare. You wouldn't be the one pushing the button. Is that illegal? Whet would? What would stop it from happening? Now, leb ask you this, if ukraine could buy that service for it would be expensive, but if they could buy