A schoolgirl attends morning assembly in a school in the southern coastal town of Mariupol, September 1, 2014. September 1 marks the start of a new academic year for students in Ukraine. (Photo by Vasily Fedosenko/Reuters)

Schoolgirls talk during morning assembly in a school in the southern coastal town of Mariupol, September 1, 2014. (Photo by Vasily Fedosenko/Reuters)

Schoolgirls and teachers listen to the national anthem during morning assembly in a school in the southern coastal town of Mariupol, September 1, 2014. (Photo by Vasily Fedosenko/Reuters)

A schoolgirl listens to the national anthem during morning assembly in a school in the southern coastal town of Mariupol, September 1, 2014. (Photo by Vasily Fedosenko/Reuters)

Students dance during morning assembly in a school in the southern coastal town of Mariupol, September 1, 2014. (Photo by Vasily Fedosenko/Reuters)

Students file in through the entrance to start their classes in a school in the southern coastal town of Mariupol, September 1, 2014. (Photo by Vasily Fedosenko/Reuters)

First graders wait for a festive ceremony to mark the start of another school year in Slaviansk, September 1, 2014. (Photo by Gleb Garanich/Reuters)

Students attend their first lesson of the day in a school in the southern coastal town of Mariupol, September 1, 2014. (Photo by Vasily Fedosenko/Reuters)

First graders wait for a festive ceremony to mark the start of another school year in Slaviansk, September 1, 2014. (Photo by Gleb Garanich/Reuters)

First graders wait for a festive ceremony to mark the start of another school year in Slaviansk, September 1, 2014. (Photo by Gleb Garanich/Reuters)

First graders take part in a festive ceremony to mark the start of another school year in Slaviansk, September 1, 2014. (Photo by Gleb Garanich/Reuters)

First graders attend a festive ceremony to mark the start of another school year in Slaviansk, September 1, 2014. (Photo by Gleb Garanich/Reuters)

First graders attend a festive ceremony to mark the start of another school year in Slaviansk, September 1, 2014. (Photo by Gleb Garanich/Reuters)

First graders attend a festive ceremony to mark the start of another school year in Slaviansk, September 1, 2014. (Photo by Gleb Garanich/Reuters)

First graders attend a festive ceremony to mark the start of another school year in Slaviansk, September 1, 2014. (Photo by Gleb Garanich/Reuters)

First graders attend a festive ceremony to mark the start of another school year in Slaviansk, September 1, 2014. (Photo by Gleb Garanich/Reuters)