Russia vows troops will stay in Ukraine's Crimea region
Russia has vowed that its troops will remain in Ukraine to protect Russian interests and citizens until the political situation has been normalised.
Foreign Minister Sergei Lavrov said Russia was defending human rights against ultra-nationalist threats.
Russia is now in de facto military control of the Crimea region, despite Western condemnation of a violation of Ukraine's sovereignty.
Ukraine has ordered full mobilisation to counter the military intervention.
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