Russia has unveiled a new-generation battle tank called Armata T-14 ahead of World War Two Victory Day celebrations on 9 May. It is among several new weapons systems featuring in a vast parade on 9 May. It is 70 years since the Soviet and Allied armies defeated Nazi Germany in 1945. The Russian defence ministry has posted photos of the new military hardware, taken during a rehearsal. Most Western leaders will not go to Moscow because of the Ukraine crisis.