Russia's foreign minister says Moscow 'will react' if the EU imposes new sanctions over the crisis in Ukraine.
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Europe's already levelled tough measures at Russia but says these will increase if they don't keep to a peace deal agreed on Friday.
A ceasefire between Ukrainian troops and pro-Russian rebels appears to have held overnight.
Sky's Katie Stallard is in Mariupol in eastern Ukraine, and says it's a tense time for troops on the ground
