Ukraine, Kiev, 25 janvier 2014. Mouvement pro-europeen en Ukraine. Face a face entre les pro-europeens et les services de police, a la barricade de la rue rue Grouchevski (pres de la place de l'Independance)

Ukraine, Kiev, 25 janvier 2014. Mouvement pro-europeen en Ukraine. Face a face entre les pro-europeens et les services de police, a la barricade de la rue rue Grouchevski (pres de la place de l'Independance)

Ukraine, Kiev, 25 janvier 2014. Mouvement pro-europeen en Ukraine. Face a face entre les pro-europeens et les services de police, a la barricade de la rue rue Grouchevski (pres de la place de l'Independance)

Ukraine, Kiev, 25 janvier 2014. Mouvement pro-europeen en Ukraine. Face a face entre les pro-europeens et les services de police, a la barricade de la rue rue Grouchevski (pres de la place de l'Independance)

Ukraine, Kiev, 25 janvier 2014. Mouvement pro-europeen en Ukraine. Face a face entre les pro-europeens et les services de police, a la barricade de la rue rue Grouchevski (pres de la place de l'Independance)

Doctor 'Denis' treats a patient at a volunteers' first aid point during the demonstrations in Kiev on Saturday, 25th January, 2014. LEHTIKUVA / Antti Aimo-Koivisto *** FINLAND OUT. NO THIRD PARTY SALES. ***

Doctor 'Denis' treats a patient at a volunteers' first aid point during the demonstrations in Kiev on Saturday, 25th January, 2014. LEHTIKUVA / Antti Aimo-Koivisto *** FINLAND OUT. NO THIRD PARTY SALES. ***

Doctor 'Denis' at a volunteers' first aid point during the demonstrations in Kiev on Saturday, 25th January, 2014. LEHTIKUVA / Antti Aimo-Koivisto *** FINLAND OUT. NO THIRD PARTY SALES. ***

Protesters clash with police in central Kiev, Ukraine, early Saturday, Jan. 25, 2014. As riots spread from Ukraine's embattled capital to nearly half of the country, President Viktor Yanukovych promised Friday to reshuffle his government and make other concessions - but a top opposition leader said nothing short of his resignation would do. Hours after the president's comments, huge fireballs lit up the night sky in central Kiev and plumes of thick black smoke rose from burning tires at giant barricades erected by protesters. (AP Photo/Sergei Chuzavkov)

A protester protects himself from water guns during a clash with riot police in central Kiev, Ukraine, Saturday Jan. 25, 2014. Ukraine's Interior Ministry has accused protesters in Kiev of capturing two of its officers as violent clashes have resumed in the capital and anti-government riots spread across Ukraine. (AP Photo/Efrem Lukatsky)

Protesters throw Molotov cocktails towards riot police during a clash in central Kiev, Ukraine, Saturday Jan. 25, 2014. Ukraine's Interior Ministry has accused protesters in Kiev of capturing two of its officers as violent clashes have resumed in the capital and anti-government riots spread across Ukraine. (AP Photo/Efrem Lukatsky)