• SLOVYANSK, UKRAINE - MAY 13: Ukranian military soldiers man a highway checkpoint on May 13, 2014 near Slovyansk, Ukraine. At least 6 Ukranian soldiers were killed and more were reportedly injured by pro-Russian separatists in the nearby city of Kramatorsk. Credit John Moore/Getty Images

    A Ukrainian general and 11 servicemen were killed Thursday when pro-Russian rebels shot down a military helicopter near Slovyansk in the restive eastern regions of Ukraine.

    LAST UPDATE : May 29, 2014, 11:06 AM EDT
  • BEIJING, CHINA - APRIL 15: Russian Foreign Minister Sergey Lavrov (2nd, L) attends a meeting with Chinese Foreign Minister Wang Yi (not pictured) at Diaoyutai Guesthouse on April 15, 2014 in Beijing, China. Lavrov is on a one-day visit to China. Credit Pool/Getty Images

    Russia's foreign minister has ruled out holding fresh talks to defuse the Ukraine crisis, unless pro-Russian opposition groups are involved.

    LAST UPDATE : May 06, 2014, 11:38 AM EDT
  • Russian activist blockade following an assault by the Ukrainian army on May 3, 2014 in Kramatovsk, Ukraine.

    Pro-Russian militiamen battled Ukrainian government forces Monday in the eastern city of Slovyansk, killing at least four troops and shooting down a military helicopter, the government said.

    LAST UPDATE : May 05, 2014, 11:45 AM EDT