Iranian President Hassan Rouhani (L) attends as army commander General Ataollah Salehi (3rd R) and commander of Iran's army ground forces, General Ahmad Reza Pourdastan (R) salute during the Army Day parade in Tehran on April 18, 2015. Amid rising tension between Iran and Saudi Arabia, Rouhani said that Iran's military is purely for defence and should not be seen as an aggressive threat in the Middle East. AFP PHOTO/BEHROUZ MEHRI (Photo credit should read BEHROUZ MEHRI/AFP/Getty Images)
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