A tank drives along a street of the Russian southern town of Matveev Kurgan

A tank drives along a street of the Russian southern town of Matveev Kurgan, near the Russian-Ukrainian border in Rostov region, Russia, May 26, 2015. The convoy of nine tanks, which were delivered by train the day before, drove along streets of the town on Tuesday, according to a Reuters journalist. REUTERS/Maria Tsvetkova