The measures targeting Russia's economy were due to expire next month.
Preben Aamann, the European Council spokesman, tweeted: "Russia sanctions unanimously extended for another six months because of a lack of Minsk Agreements implementation."
The EU imposed sanctions on Russia in 2014 after it annexed Ukraine's Crimean Peninsula. They have been routinely rolled over due to the lack of progress on the peace front.
More than 13,000 people have been killed since 2014 in fighting between Ukrainian troops and Russian-backed separatists in eastern Ukraine.
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