In the space of a few days this week, France, the United States and Germany all announced they would donate to Ukraine powerful armored vehicles: French AMX-10RC scout vehicles, American M-2 infantry fighting vehicles and German Marder IFVs. So which of Ukraine’s allies is going to be the first to pledge Leopard 2 tanks? There are several candidates, and it might be only a matter of time—and not much time—before one of them opens up its arsenals and turns the engines of long-stored, surplus Leopards.