"Germany will always be at the forefront when it comes to supporting Ukraine," Chancellor Olaf Scholz told the German parliament, to applause.
"At a critical moment in Russia's war, these tanks can help Ukraine defend itself, win and stand as an independent nation," NATO Secretary-General Jens Stoltenberg said.
[1/13] Germany delivers its first Leopard tanks to Slovakia as part of a deal after Slovakia donated fighting vehicles to Ukraine, in Bratislava, Slovakia, December 19, 2022.
Kremlin spokesman Dmitry Peskov said any U.S. tanks sent to Ukraine would "burn like all the rest".
Ukraine defeated Russia's troops on the outskirts of Kyiv last year and later drove them out of swathes of occupied land.