How reliant is Europe on Russia for oil and gas?

European gas prices have risen after the approval of the Nord Stream 2 pipeline to Germany was halted because of Russia's actions in Ukraine.

The price of oil has also increased sharply this week.

With a quarter of the European Union's petroleum oil imports coming from Russia, along with almost half of its gas, there are concerns that Russia could restrict supplies in retaliation for measures taken against it.

Russia supplies about 40% of the EU’s natural gas imports. Most of the rest comes from Norway and Algeria.

Russia sends gas to Europe through several main pipelines - such as Nord Stream 1, Yamal-Europe and Brotherhood.