Reuters reports this with reference to the Spanish Armed Forces.
The training at the military base in the northeastern city of Zaragoza was attended by 40 tank crew members and 15 mechanics.
"It has been intense," said Spanish instructor Captain Contreras.
The Spanish military officer noted that the Ukrainians will return home with "a very acceptable knowledge" of Leopard tanks.
"Although the tanks were different, there were many systems that coincide and that has made things much easier. With that, together with the motivation that the personnel brought and their desire to learn, we see them very well prepared to resume combat," said Captain Contreras.
The newspaper noted that one of the Ukrainian soldiers being trained had a patch on a sleeve sporting the slogan "Freedom or Death" underneath the Ukrainian flag.
At the end of February, the first Leopard tanks provided to Ukraine by its partners arrived in Ukraine.
Canada promised to provide Ukraine with a total of 8 Leopard 2 tanks.
On March 7, Polish Defense Minister Mariusz Blaszczak announced that 10 Leopard 2 tanks would be sent to Ukraine by the end of the week (March 12) in addition to the 4 tanks already sent.