“if sending some Abrams tanks is the key to breaking the impasse on a potentially much greater shipment of Leopards, President Biden should give his assent. He should do so not only to add muscle to Ukraine’s arsenal at what is likely to be a decisive moment in the war, but also to maintain Western resolve and unity in the face of the gravest threat it has faced in more than a generation.”
https://www.washingtonpost.com/opinions/2023/01/21/germany-ukraine-leopard-tanks-biden/