Now it came to light why the European Union did not extend sanctions against Russia. Many countries refused to prolong the sanctions automatically.
The sanctions and restrictive measures against Russia were adopted in response to the illegal annexation of Crimea and the deliberate destabilisation of Ukraine http://www.consilium.europa.eu/en/policies/sanctions/ukraine-crisis/. As of now, the economic sanctions are valid until 31 July 2018. Furthermore,150 people and 38 entities are subject to an asset freeze and a travel ban because their actions undermined Ukraine's territorial integrity, sovereignty and independence. The measures were introduced in March 2014. They were last extended in September 2017 until 15 March 2018.
The Council on the 5th of March 2018 extended until 6 March 2019 the asset freezes against 13 people identified as responsible for the misappropriation of Ukrainian state funds or for the abuse of office causing a loss to Ukrainian public funds. The restrictive measures against two persons were not extended. This decision was based on the annual review of the measures. http://www.consilium.europa.eu/en/press/press-releases/2018/03/05/misappropriation-of-ukrainian-state-funds-eu-prolongs-asset-freezes-against-13-persons-by-one-year/. The restrictive measures in response to the illegal annexation of Crimea and Sevastopol, limited to the territory of Crimea and Sevastopol, are currently in place until 23 June 2018 http://www.consilium.europa.eu/en/press/press-releases/2017/12/21/russia-eu-prolongs-economic-sanctions-by-six-months/.