'The Council (of EU member states) extended the restrictive measures in response to the illegal annexation of Crimea and Sevastopol by Russia until 23 June 2019,' the bloc said in a statement.
'Four years on from the illegal annexation of the Autonomous Republic of Crimea and the city of Sevastopol by the Russian Federation, the EU reiterated that it does not recognise and continues to condemn this violation of international law,' it said.
The sanctions were imposed in the wake of Russia's annexation of the strategic Black Sea peninsula in March 2014. More than 10,000 people have been killed since the Moscow-backed insurgency broke out in eastern Ukraine in April 2014 following the annexation.
The EU insists Russia must be held to account for its support of the rebels. But Moscow says Brussels is at fault for aiding the overthrow of a legitimate government in Kiev, referring to the ouster of a pro-Russian president in February 2014 after three months of sometimes deadly protests.
In addition to the Crimea measures, the EU has a range of other sanctions in place related to Russia's activities in Ukraine, including damaging economic sanctions and individual travel bans and asset freezes targeting more than 150 people.
Ukraine and its Western allies accuse Russia of funnelling troops and arms across the border. Moscow has denied the allegations despite overwhelming evidence that it has been involved in the fighting and gives open political support to the rebels.