SLAVYANSK, UKRAINE - APRIL 16: Armed Pro-Russian soldiers stand guard in the eastern Ukrainian city of Slavyansk on April 16, 2014. Six tanks flying the Russian flag and carrying perhaps 150 heavily armed men entered the city Wednesday morning, pulled up in front of a government building already occupied by pro-Russian forces, and began clearing the area of civilians. Olga Engalycheva / Anadolu Agency
SLAVYANSK, UKRAINE - APRIL 16: Armed Pro-Russian soldiers stand guard in the eastern Ukrainian city of Slavyansk on April 16, 2014. Six tanks flying the Russian flag and carrying perhaps 150 heavily armed men entered the city Wednesday morning, pulled up in front of a government building already occupied by pro-Russian forces, and began clearing the area of civilians. Olga Engalycheva / Anadolu Agency
SLAVYANSK, UKRAINE - APRIL 16: Armed Pro-Russian soldiers stand guard in the eastern Ukrainian city of Slavyansk on April 16, 2014. Six tanks flying the Russian flag and carrying perhaps 150 heavily armed men entered the city Wednesday morning, pulled up in front of a government building already occupied by pro-Russian forces, and began clearing the area of civilians. Olga Engalycheva / Anadolu Agency
SLAVYANSK, UKRAINE - APRIL 16: Armed Pro-Russian soldiers stand guard in the eastern Ukrainian city of Slavyansk on April 16, 2014. Six tanks flying the Russian flag and carrying perhaps 150 heavily armed men entered the city Wednesday morning, pulled up in front of a government building already occupied by pro-Russian forces, and began clearing the area of civilians. Olga Engalycheva / Anadolu Agency
SLAVYANSK, UKRAINE - APRIL 16: Armed Pro-Russian soldiers stand guard in the eastern Ukrainian city of Slavyansk on April 16, 2014. Six tanks flying the Russian flag and carrying perhaps 150 heavily armed men entered the city Wednesday morning, pulled up in front of a government building already occupied by pro-Russian forces, and began clearing the area of civilians. Olga Engalycheva / Anadolu Agency
SLAVYANSK, UKRAINE - APRIL 16: Armed Pro-Russian soldiers stand guard in the eastern Ukrainian city of Slavyansk on April 16, 2014. Six tanks flying the Russian flag and carrying perhaps 150 heavily armed men entered the city Wednesday morning, pulled up in front of a government building already occupied by pro-Russian forces, and began clearing the area of civilians. Olga Engalycheva / Anadolu Agency
SLAVYANSK, UKRAINE - APRIL 16: Armed Pro-Russian soldiers stand guard in the eastern Ukrainian city of Slavyansk on April 16, 2014. Six tanks flying the Russian flag and carrying perhaps 150 heavily armed men entered the city Wednesday morning, pulled up in front of a government building already occupied by pro-Russian forces, and began clearing the area of civilians. Olga Engalycheva / Anadolu Agency