ພາບ​ຫຼ້າ​ສຸດ ຈາກ ຢູ​ເຄ​ຣນ

An armed man of the Donbass Battalion, a volunteer militia group that has stated its intent to fight in support of Ukrainian unity, is on patrol, standing atop a storage tank with a sign "Flammable - Don't smoke" at their base in the eastern Ukraine village of Velyka Novosilka, May 16, 2014.

Workers of Metinvest, majority-owned by multi-billionaire Rinat Akhmetov's System Capital Management, remove barricades and debris in front of the City Hall, in Mariupol, May 14, 2014.

Troops with the Donbass Battalion, a volunteer militia group that has stated its intent to fight in support of Ukrainian unity, sleep in the hay, in the village of Velyka Novosilka, near Donetsk, eastern Ukraine, May 16, 2014.

Pro-Russian rebels stand next to new trenches at a fortified front line rebel position near the town of Slovyansk, May 16, 2014.

Ukrainian presidential candidate Petro Poroshenko is welcomed by his supporters during a rally in Konotop, Ukraine, May 15, 2014.

Ukrainian paratroopers ride atop an armored personnel carrier in the village of Starovarvarivka, Ukraine, May 15, 2014.

A Ukrainian soldier digs a trench outside the village of Bylbasivka near the eastern Ukrainian town of Slovyansk, May 15, 2014.

A pro-Russian man shoots a grenade launcher against Ukrainian government troops at a checkpoint outside Slovyansk, eastern Ukraine, May 15, 2014.

Armed pro-Russian men prepare themselves to confront Ukrainian government troops at a checkpoint outside Slovyansk, eastern Ukraine, May 15, 2014.

Pro-Russian gunmen guard a checkpoint outside Slovyansk, eastern Ukraine, May 15, 2014.