In this handout photo released by the Russian Defence Ministry, Commander of the Iranian Army's Ground Forces Kioumars Heydari, second left, and Russian Ground Forces Commander-in-chief Oleg Salyukov, third left, attend a wreath-laying ceremony at the Tomb of the Unknown Soldier by the Kremlin wall in Moscow, Russia. A military delegation of Iran arrived to Moscow to discuss bilateral military co-operation. Editorial use only, no archive, no commercial use.