Soldiers of the National Guard of Ukraine perform exercises at a military training centre outside Kiev, Ukraine, Thursday, May 8, 2014. The pro-Russia insurgency in eastern Ukraine decided Thursday to go ahead with Sunday's referendum on autonomy despite a call from Russian President Vladimir Putin to delay it. (AP Photo/Sergei Chuzavkov)

Soldiers of the National Guard of Ukraine perform exercises at a military training outside Kiev, Ukraine, Thursday, May 8, 2014. The pro-Russia insurgency in eastern Ukraine decided Thursday to go ahead with Sunday's referendum on autonomy despite a call from Russian President Vladimir Putin to delay it.(AP Photo/Sergei Chuzavkov)

Soldiers from the National Guard of Ukraine fire weapons on a training firing field outside Kiev, Ukraine, Thursday, May 8, 2014. The pro-Russia insurgency in eastern Ukraine decided Thursday to go ahead with Sunday's referendum on autonomy despite a call from Russian President Vladimir Putin to delay it. (AP Photo/Sergei Chuzavkov)

Soldiers of the National Guard of Ukraine perform exercises at a military training centre outside Kiev, Ukraine, Thursday, May 8, 2014. The pro-Russia insurgency in eastern Ukraine decided Thursday to go ahead with Sunday's referendum on autonomy despite a call from Russian President Vladimir Putin to delay it. (AP Photo/Sergei Chuzavkov)

Soldiers from the National Guard of Ukraine fire weapons on a training firing field outside Kiev, Ukraine, Thursday, May 8, 2014. The pro-Russia insurgency in eastern Ukraine decided Thursday to go ahead with Sunday's referendum on autonomy despite a call from Russian President Vladimir Putin to delay it. (AP Photo/Sergei Chuzavkov)

Soldiers from the National Guard of Ukraine fire weapons on a training firing field outside Kiev, Ukraine, Thursday, May 8, 2014. The pro-Russia insurgency in eastern Ukraine decided Thursday to go ahead with Sunday's referendum on autonomy despite a call from Russian President Vladimir Putin to delay it. (AP Photo/Sergei Chuzavkov)

Soldiers of the National Guard of Ukraine perform exercises at a military training outside Kiev, Ukraine, Thursday, May 8, 2014. The pro-Russia insurgency in eastern Ukraine decided Thursday to go ahead with Sunday's referendum on autonomy despite a call from Russian President Vladimir Putin to delay it. (AP Photo/Sergei Chuzavkov)

Soldiers of the National Guard of Ukraine perform exercises at a military training centre outside Kiev, Ukraine, Thursday, May 8, 2014. The pro-Russia insurgency in eastern Ukraine decided Thursday to go ahead with Sunday's referendum on autonomy despite a call from Russian President Vladimir Putin to delay it. (AP Photo/Sergei Chuzavkov)

Soldiers of the National Guard of Ukraine perform exercises at a military training centre outside Kiev, Ukraine, Thursday, May 8, 2014. The pro-Russia insurgency in eastern Ukraine decided Thursday to go ahead with Sunday's referendum on autonomy despite a call from Russian President Vladimir Putin to delay it.(AP Photo/Sergei Chuzavkov)

Ukrainian National guard recruits take part in military drills in Novy-Petrivtsi on May 8, 2014. Russian Defence Minister Sergei Shoigu said today that the country's nuclear capabilities on land, sea and air were on combat alert, as President Vladimir Putin inspected battle readiness amid a crisis in Ukraine. AFP PHOTO/ SERGEI SUPINSKY

Ukrainian National guard recruits take part in military drills in Novy-Petrivtsi on May 8, 2014. Russian Defence Minister Sergei Shoigu said today that the country's nuclear capabilities on land, sea and air were on combat alert, as President Vladimir Putin inspected battle readiness amid a crisis in Ukraine. AFP PHOTO/ SERGEI SUPINSKY

Ukrainian National guard recruits take part in military drills in Novy-Petrivtsi on May 8, 2014. Russian Defence Minister Sergei Shoigu said today that the country's nuclear capabilities on land, sea and air were on combat alert, as President Vladimir Putin inspected battle readiness amid a crisis in Ukraine. AFP PHOTO/ SERGEI SUPINSKY

TOPSHOTS Ukrainian National guard recruits take part in military drills in Novy-Petrivtsi on May 8, 2014. Russian Defence Minister Sergei Shoigu said today that the country's nuclear capabilities on land, sea and air were on combat alert, as President Vladimir Putin inspected battle readiness amid a crisis in Ukraine. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

A female recruit takes part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Female recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY

Recruits take part in military exercises in the shooting range of the Ukrainian National Guard near the village of Novy-Petrivtsi not far from Kiev on May 8, 2014. The European Union said a decision by pro-Moscow rebels to go ahead with an independence vote in east Ukraine would only worsen the crisis in the former Soviet republic. AFP PHOTO/ SERGEI SUPINSKY