Kerry urges Russia to support efforts freeing observers

US secretary of state John Kerry has urged Russia to support efforts to free military observers held by pro-Moscow forces in Ukraine.

US Secretary of State John Kerry (right) with Russian Foreign Minister Sergei Lavrov Credit: Peter Macdiarmid/PA Wire

Mr Kerry also told Russian foreign minister Sergei Lavrov in a phone call that the United States was concerned that Moscow's actions were "undermining stability, security and unity" in Ukraine.

The US State Department said Mr Kerry cited Russia's "provocative" troop movements along the border, Moscow's support for separatists and its "inflammatory rhetoric".

Read: Russia 'will take all steps' to free OSCE observers in Ukraine

Read: G7 agrees to impose additional sanctions on Russia

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Pro-Russian separatists seize another eastern Ukraine town

Armed pro-Russian separatists have taken control of the east Ukrainian town of Kostyantynivka today. Separatists in Slaviansk yesterday released one of eight OSCE monitors they are holding.