The leaders of the European Union are expected to put pressure on Russian President Dimitry Medvedev to make him give assurance on energy supply, climate change, trade and human rights.

Russia halt natural gas delivery because of a dispute with Ukraine last January and during an August 2008 war with Georgia, both which left millions of EU citizens in the cold.

Russia is the EU's largest energy supplier, providing 20 percent of the Union’s natural gas through the Ukrainian pipeline.

Meanwhile, the sides are expected to agree on a number of agreements, including on border control.

However, Prime Minister Vladimir Putin warned last week that Russia would again close the valves on gas pipelines flowing west if Ukraine fails to pay for its shipments.