What is the Leopard 2 Tank and Why is Its Possible Delivery to Kiev So Explosively Contentious?

Germany’s Leopard 2 main battle tank has been on the lips of European, Ukrainian and Russian officials for over a week amid pressure by Berlin’s allies to send the heavy weapons system to Kiev. When was the tank created? What environments is it designed to fight in? Why is there so much trepidation about its deployment in Ukraine? Sputnik explains.