Tanks for Ukraine, NFG?  proposes that Western tanks might have an unacceptable loss  rate. A loophole due to Russian incompetence allows for negation of  the logic, with successful deployment.

The same question arises for the F16, a non stealthy 4th generation aircraft in the process of replacement by NATO. The estimate is that the loss rate will be fairly low. Ukraine will get better use out of the F16 than is widely anticipated.

Unfortunately, elaboration is not advisable.