European Union leaders will try to agree at the summit that the upcoming package of sanctions should include an embargo on Russian oil imports, but exclude pipeline crude oil supplies.

Having failed to agree on all the details of the oil embargo, the leaders will leave the final approval of the package for later, Reuters reported.

"The European Council agrees that the sixth package of sanctions against Russia will cover crude oil, as well as petroleum products, delivered from Russia into Member States, with a temporary exception for crude oil delivered by pipeline," the latest draft conclusions, seen by Reuters, said.

"The European Council therefore urges the Council to finalise and adopt it without delay, ensuring fair competition and a level playing field in the EU Single Market, and solidarity among Member States in case of sudden interruptions of supply," the draft said.

The 27 member states of the EU will decide as soon as possible on the temporary exemption for crude oil supplied by pipeline.