Russia 's announced choice of a theme for the meeting , energy security , turned into an embarrassment earlier this year after the authorities nearly shut off the supply of natural gas to Europe in the middle of winter after a dispute with Ukraine over prices .
Europe /location/location/contains Russia
Europe /location/location/contains Ukraine
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Europe
LOCATION
Russia
LOCATION
/location/location/contains
Europe
LOCATION
Ukraine
LOCATION
/location/location/contains