https://www.businessinsider.com/german-arms-maker-rheinmetall-offers-ukraine-new-panther-kf51-tank-2023-3

This is kind of Spanish Civil War, in which everybody got to test new weapon systems.

To be clear: Ukraine should get this tank, and use it to push Russia back to the original borders and out of Crimea. Then, Russia can be civilized and engage in trade competition rather than violence.