Why are tanks so crucial in the Ukraine war?

The supply of weapons to Ukraine has become something of an international political battle. Germany has come under intense pressure to change its position and allow the supply of its most modern Leopard 2 tanks to Kyiv. What's behind Germany's reluctance? And why are tanks seen as so crucial in the war? Join host Nick Clark. Guests: Arthur Denaro - Retired British Army Major General.Domitilla Sagramoso - Senior Lecturer in Security and Development at King's College London.  Ben Aris - Founder and Editor-in-chief of BNE IntelliNews in Berlin.