A pro-Russian separatist waves to his family sitting on a bus destined for Rostov-on-Don in Russia, in Donetsk
A pro-Russian separatist waves to his family sitting on a bus destined for Rostov-on-Don in Russia at a collection point in the eastern Ukrainian city of Donetsk July 14, 2014. Russia threatened Ukraine on Sunday with "irreversible consequences" after a Russian man was killed by a shell fired across the border, while Kiev said Ukrainian warplanes struck again at separatist positions in the east of the country, inflicting big losses. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST)
Residents of the Donetsk region in eastern Ukraine sit on a bus destined for Rostov-on-Don in Russia
Residents of the Donetsk region in eastern Ukraine look out of the window while sitting inside a bus destined for Rostov-on-Don in Russia at a collection point in Donetsk July 14, 2014. Russia threatened Ukraine on Sunday with "irreversible consequences" after a Russian man was killed by a shell fired across the border, while Kiev said Ukrainian warplanes struck again at separatist positions in the east of the country, inflicting big losses. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
Residents of the Donetsk region in eastern Ukraine prepare to board buses for Rostov-on-Don in Russia
Residents of the Donetsk region in eastern Ukraine prepare to board buses for Rostov-on-Don in Russia from a collection point in Donetsk July 14, 2014. Russia threatened Ukraine on Sunday with "irreversible consequences" after a Russian man was killed by a shell fired across the border, while Kiev said Ukrainian warplanes struck again at separatist positions in the east of the country, inflicting big losses. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST)
A shell crater is seen as Ukrainian serviceman guards a car with sappers, in the eastern Ukrainian village of Semenovka
A shell crater is seen as Ukrainian serviceman guards a car with sappers, in the eastern Ukrainian village of Semenovka July 13, 2014. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY TPX IMAGES OF THE DAY)
Pro-Russian politician Oleg Tsarev attends a rally in support of Novorossiya (New Russia) on Lenin Square in the center of Donetsk
Pro-Russian politician Oleg Tsarev attends a rally in support of Novorossiya (New Russia) on Lenin Square in the center of the eastern Ukrainian city of Donetsk, July 13, 2014. Russia threatened Ukraine on Sunday with "irreversible consequences" after a Russian man was killed by a shell fired across the border, while Kiev said Ukrainian warplanes struck again at separatist positions in the east of the country, inflicting big losses. Although both sides have reported cross-border shootings in the past, it appears to be the first time Moscow has reported fatalities on its side of the border in the three-month conflict which has killed hundreds of people in Ukraine. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY TPX IMAGES OF THE DAY)
Pro-Russian politician Oleg Tsarev attends a rally in support of Novorossiya (New Russia) on Lenin Square in the center of Donetsk
Pro-Russian politician Oleg Tsarev attends a rally in support of Novorossiya (New Russia) on Lenin Square in the center of the eastern Ukrainian city of Donetsk, July 13, 2014. Russia threatened Ukraine on Sunday with "irreversible consequences" after a Russian man was killed by a shell fired across the border, while Kiev said Ukrainian warplanes struck again at separatist positions in the east of the country, inflicting big losses. Although both sides have reported cross-border shootings in the past, it appears to be the first time Moscow has reported fatalities on its side of the border in the three-month conflict which has killed hundreds of people in Ukraine. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Pro-Russian politician Oleg Tsarev attends a rally in support of Novorossiya (New Russia) on Lenin Square in the center of Donetsk
Pro-Russian politician Oleg Tsarev attends a rally in support of Novorossiya (New Russia) on Lenin Square in the center of the eastern Ukrainian city of Donetsk, July 13, 2014. Russia threatened Ukraine on Sunday with "irreversible consequences" after a Russian man was killed by a shell fired across the border, while Kiev said Ukrainian warplanes struck again at separatist positions in the east of the country, inflicting big losses. Although both sides have reported cross-border shootings in the past, it appears to be the first time Moscow has reported fatalities on its side of the border in the three-month conflict which has killed hundreds of people in Ukraine. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
A pro-Russian separatist stands guard during a rally in support of Novorossiya (New Russia) on Lenin Square in the center of Donetsk
A pro-Russian separatist stands guard during a rally in support of Novorossiya (New Russia) on Lenin Square in the center of the eastern Ukrainian city of Donetsk, July 13, 2014. Russia threatened Ukraine on Sunday with "irreversible consequences" after a Russian man was killed by a shell fired across the border, while Kiev said Ukrainian warplanes struck again at separatist positions in the east of the country, inflicting big losses. Although both sides have reported cross-border shootings in the past, it appears to be the first time Moscow has reported fatalities on its side of the border in the three-month conflict which has killed hundreds of people in Ukraine. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
A pro-Russian separatist stands guard during a rally in support of Novorossiya (New Russia) on Lenin Square in the center of Donetsk
A pro-Russian separatist stands guard during a rally in support of Novorossiya (New Russia) on Lenin Square in the center of the eastern Ukrainian city of Donetsk, July 13, 2014. Russia threatened Ukraine on Sunday with "irreversible consequences" after a Russian man was killed by a shell fired across the border, while Kiev said Ukrainian warplanes struck again at separatist positions in the east of the country, inflicting big losses. Although both sides have reported cross-border shootings in the past, it appears to be the first time Moscow has reported fatalities on its side of the border in the three-month conflict which has killed hundreds of people in Ukraine. REUTERS/Maxim Zmeyev (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)