A woman looks at a Ukrainian armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine
A woman looks at a Ukrainian armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
A man talks to Ukrainian soldiers sitting on an armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine
A man talks to Ukrainian soldiers sitting on an armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
A man talks to Ukrainian soldiers sitting on an armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine
A man talks to Ukrainian soldiers sitting on an armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
A man rides a bike past a Ukrainian armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine
A man rides a bike past a Ukrainian armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A man rides a bike past a Ukrainian armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine
A man rides a bike past a Ukrainian armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
A man helps a pro-Russia rebel climb through a window of the city hall in Mariupol, eastern Ukraine
A man helps a pro-Russia rebel climb through a window of the city hall in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A Ukrainian flag burns outside the city hall in Mariupol, eastern Ukraine
A Ukrainian flag burns outside the city hall in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russia rebel wearing a gas mask stands beside a Russian flag on the balcony of the city hall in Mariupol, eastern Ukraine
A pro-Russia rebel wearing a gas mask stands beside a Russian flag on the balcony of the city hall in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russia rebel wearing a gas mask enters the city hall in Mariupol, eastern Ukraine
A pro-Russia rebel wearing a gas mask enters the city hall in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)
A pro-Russia rebel wearing a gas mask walks inside the city hall in Mariupol, eastern Ukraine
A pro-Russia rebel wearing a gas mask walks inside the city hall in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then withdrew, making no attempt to hold onto the building, witnesses said on Wednesday. REUTERS/Marko Djurica (UKRAINE - Tags: POLITICS CIVIL UNREST)