ພາບຫຼ້າສຸດ ຈາກ ຢູເຄຣນ

U.S. President Barack Obama, right, greets Estonian school children waving U.S. and Estonian national flags during a welcome ceremony at the Kadriorg Palace in Tallinn, Estonia, Sept. 3, 2014

U.S. President Barack Obama, left, and Estonia's President Toomas Hendrik Ilves attend a welcome ceremony at the Kadriorg Palace in Tallinn, Estonia, Sept. 3, 2014.

A man shows the remains of a military projectile in the village of Spartak outside Donetsk, Sept. 3, 2014.

Mongolia's President Elbegdorj Tsakhia, right, and Russian President Vladimir Putin meet at the State Palace in Ulan Bator, Mongolia, Sept. 3, 2014

A damaged gymnasium is seen at a school in the village of Spartak outside Donetsk, Sept. 3, 2014.

Mongolia's President Elbegdorj Tsakhia, right, and Russian President Vladimir Putin shake hands as they pose for photos at the State Palace in Ulan Bator, Mongolia, Sept. 3, 2014.

Ukrainian soldiers sit in a military vehicle in the southern coastal town of Mariupol, Sept. 2, 2014.

A detainee held by pro-Russian rebels is tied up a short distance  from a column of destroyed Ukranian military vehicles in the village of Novokaterynivka, eastern Ukraine, Sept. 2, 2014.