A Syrian clerk of a dress shop stands beside a poster of presidential candidate Bashar al-Assad in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)

Syrian boys train at a football field where a poster of presidential candidate Bashar al-Assad is seen in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)

A giant poster of Syria's presidential candidate Bashar al-Assad is seen in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)

A Syrian cigarette vendor stands by his own stall pasted with a poster of presidential candidate Bashar al-Assad in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)

A Syrian woman walks by a wall made up with wasted materials in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)

A Syrian disabled man walks by a checkpoint on which a poster of presidential candidate Bashar al-Assad is seen in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)

A Syrian army soldier guards beside a giant poster of presidential candidate Bashar al-Assad in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)

Syrian old people sit along a street where a banner of presidential candidate Bashar al-Assad is seen in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)

A Syrian boy walks into a lane where posters of presidential candidate Bashar al-Assad and Syria's national flags are seen in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)

A Syrian boy poses in front of a stall selling souvenirs in Damascus, capital of Syria, on May 31, 2014, ahead of the upcoming presidential election on June 3. (Xinhua/Pan Chaoyue)