Protesters shout slogans as they take part in a pro-Russia demonstration in the southern Ukrainian city of Odessa on April 26, 2014. The United States and Europe have prepared fresh sanctions on Russia they could activate as soon as April 18 over the crisis in Ukraine, where tensions spiked as rebels detained an international team of military observers.  AFP PHOTO/  ALEXEY KRAVTSOV        (Photo credit should read ALEXEY KRAVTSOV/AFP/Getty Images)