Pro-Russian activists escort a man (unseen) who they say is a provocateur outside the secret service building in the eastern Ukrainian city of Luhansk on April 13, 2014.
Credit: DIMITAR DILKOFF

Reuters — Ukraine's president on Monday threatened military action after pro-Russian separatists occupying government buildings in the east ignored an ultimatum to leave and another group of rebels attacked police headquarters in the troubled region.

As the 9 a.m. deadline issued by authorities in Kyiv expired, a Reuters reporter in the flashpoint city of Slaviansk, where armed men had seized two government buildings, saw nothing to show the rebels were obeying the ultimatum.

  • Armed men guard at a regional state building seized by the separatists in the eastern Ukrainian city of Slovyansk on April 18, 2014.
    Credit: GENYA SAVILOV
  • People take pictures of men wearing military fatigues standing guard outside the regional state building seized by pro-Russian separatists in the eastern Ukrainian city of Slovyansk on April 16, 2014.
    Credit: GENYA SAVILOV
  • Armed men wearing military fatigues stand guard by Armored Personnel Carriers (APC) outside the regional state building seized by pro-Russian separatists in the eastern Ukrainian city of Slovyansk on April 16, 2014.
    Credit: GENYA SAVILOV
  • Pro-Russian activists guard a barricade outside the regional police building they seized in the eastern Ukrainian city of Slavyansk on April 15, 2014.
    Credit: GENYA SAVILOV
  • A masked Pro-Russia supporter stands guard outside the headquarters of Ukraine's security agency building in the eastern Ukrainian city of Luhansk on April 12, 2014.
    Credit: DIMITAR DILKOFF
  • Pro-Russians rally in front a barricade outside the headquarters of Ukraine's security agency building in the eastern Ukrainian city of Luhansk on April 12, 2014.
    Credit: DIMITAR DILKOFF
  • A pro-Russian activist squints as he warms himself near a fire outside the headquarters of Ukraine's security agency building in the eastern Ukrainian city of Luhansk on April 12, 2014.
    Credit: DIMITAR DILKOFF
  • A pro-Russia protester guards outside a regional police building seized by armed separatists in Slavyansk on April 13, 2014. Ukraine on Sunday launched an "anti-terrorist operation" in the eastern town of Slavyansk, where pro-Russian gunmen have seized police and security services buildings, Interior Minister Arsen Avakov said.
    Credit: GENYA SAVILOV
  • Pro-Russian activists escort a man (unseen) who they say is a provocateur outside the secret service building in the eastern Ukrainian city of Luhansk on April 13, 2014.
    Credit: DIMITAR DILKOFF
  • Pro-Russia activists warm themselves near a barricade outside a regional police building seized by armed separatists in Slavyansk on April 13, 2014.
    Credit: GENYA SAVILOV
  • Armed men in military fatigues walk in the street in the eastern Ukrainian city of Slavyansk on April 14, 2014.
    Credit: GENYA SAVILOV
  • A woman speaks to armed men in military fatigues standing guard outside a regional administration building they seized in the eastern Ukrainian city of Slavyansk on April 14, 2014.
    Credit: GENYA SAVILOV

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