The UK’s Ministry of Defence confirmed Ukrainian tank crews are back home after completing training in the UK.
Defence Secretary Ben Wallace said: “It is truly inspiring to witness the determination of Ukrainian soldiers training on Challenger 2s.
“We will continue to do all we can to support Ukraine for as long as it takes.”
Lieutenant Colonel John Stone, who oversaw the training said: “We have no doubt our friends will use the Challenger 2 tanks most effectively in the battles to come.” More Leopard 2s could be sent by other countries, provided Germany agrees.”
In addition some 40 German Marder infantry fighting vehicles, and two armoured recovery vehicles have also reached Ukraine, a security source said.
Like Britain, Germany has trained the crews. The highly regarded Leopard 2 is designed to compete with the Russian T-90 tank.
As well as the German vehicles, three Leopards donated by Portugal have also reached Ukraine, a security source said.