A Russian serviceman holds a red flag onboard a T-14 Armata tank after it stopped during a rehearsal for the Victory Day parade in Red Square in central Moscow

A Russian serviceman holds a red flag onboard a T-14 Armata tank after it stopped during a rehearsal for the Victory Day parade in Red Square in central Moscow

A Russian serviceman holds a red flag onboard a T-14 Armata tank after it stopped during a rehearsal for the Victory Day parade in Red Square in central Moscow, Russia, May 7, 2015. A new high tech battle tank hailed by Russia as a “masterpiece” appeared to break down on Red Square on Thursday during a rehearsal for the military parade at which it will make its long-awaited debut. The tank’s driver raised a small red flag to show he had problems but managed to drive on about 30 minutes later after an attempt to tow it away was abandoned, a Reuters witness said. Russia will celebrate the 70th anniversary of the victory over Nazi Germany in World War Two on May 9. REUTERS/Grigory Dukor TPX IMAGES OF THE DAY