A general view of the Shakhtar stadium surrounded by empty streets in Donetsk
A general view of the Shakhtar stadium surrounded by empty streets in Donetsk July 14, 2014. Hundreds of separatist rebels, led by a self-proclaimed defence minister from Moscow, have retreated to the Ukrainian city of Donetsk, built reinforcements and pledged to make a stand. The once-bustling city has been emptying in fear of a battle. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST CITYSCAPE TPX IMAGES OF THE DAY)
A general view of the Shakhtar stadium surrounded by empty streets in Donetsk
A general view of the Shakhtar stadium surrounded by empty streets in Donetsk July 14, 2014. Hundreds of separatist rebels, led by a self-proclaimed defence minister from Moscow, have retreated to the Ukrainian city of Donetsk, built reinforcements and pledged to make a stand. The once-bustling city has been emptying in fear of a battle. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST CITYSCAPE)
Ukraine says Russian army officers fighting with rebels
UKRAINE-CRISIS/ (PIX, UPDATE 1):UPDATE 1-Ukraine says Russian army officers fighting with rebels
A general view of the Shakhtar stadium surrounded by empty streets in Donetsk
A general view of the Shakhtar stadium surrounded by empty streets in Donetsk July 14, 2014. Hundreds of separatist rebels, led by a self-proclaimed defence minister from Moscow, have retreated to the Ukrainian city of Donetsk, built reinforcements and pledged to make a stand. The once-bustling city has been emptying in fear of a battle. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST CITYSCAPE)
Members of Ukrainian police special task force escort sappers tasked with checking buildings in Semenovka
Members of Ukrainian police special task force "Kiev-1" escort sappers (in blue) tasked with checking buildings in the eastern Ukrainian village of Semenovka, near Sloviansk, July 14, 2014. Ukraine on Monday accused Russian army officers of fighting alongside separatists in the east of the country and said Moscow was once more building up its troops on the joint border. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY CONFLICT)
Sappers checks a door from a distance by pulling a string connected to it in Semenovka
Sappers checks a door (not pictured) from a distance by pulling a string connected to it in the eastern Ukrainian village of Semenovka, near Sloviansk, July 14, 2014. Ukraine on Monday accused Russian army officers of fighting alongside separatists in the east of the country and said Moscow was once more building up its troops on the joint border. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY CONFLICT)
A member of Ukrainian police special task stands guard as a sapper checks positions of pro-Russian separatists in Semenovka
A member of Ukrainian police special task "Kiev-1" (L) stands guard as a sapper checks positions of pro-Russian separatists in the eastern Ukrainian village of Semenovka, near Sloviansk, July 14, 2014. Ukraine on Monday accused Russian army officers of fighting alongside separatists in the east of the country and said Moscow was once more building up its troops on the joint border. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY CONFLICT)
Sappers check positions of pro-Russian separatists in Semenovka
Sappers check positions of pro-Russian separatists in the eastern Ukrainian village of Semenovka, near Sloviansk, July 14, 2014. Ukraine on Monday accused Russian army officers of fighting alongside separatists in the east of the country and said Moscow was once more building up its troops on the joint border. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY CONFLICT)
Sappers check a building in Semenovka
Sappers check a building in the eastern Ukrainian village of Semenovka, near Sloviansk, July 14, 2014. Ukraine on Monday accused Russian army officers of fighting alongside separatists in the east of the country and said Moscow was once more building up its troops on the joint border. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY CONFLICT TPX IMAGES OF THE DAY)
A member of Ukrainian police special task force stands guard as sappers check a building in Semenovka
A member of Ukrainian police special task force "Kiev-1" (L) stands guard as sappers check a building in the eastern Ukrainian village of Semenovka, near Sloviansk, July 14, 2014. Ukraine on Monday accused Russian army officers of fighting alongside separatists in the east of the country and said Moscow was once more building up its troops on the joint border. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY CONFLICT TPX IMAGES OF THE DAY)