Gas prices in Europe have jumped by 9%, after Russia cut supplies to less than a fifth of a major pipeline's capacity.
Energy firm Gazprom's blamed it on technical issues, but the EU thinks Moscow's retaliating to sanctions.
The move is even pushing up prices in countries which don't have a direct link.
Sky's Europe correspondent Adam Parsons is in Germany, which relies heavily on Russian gas:
"Germany's desperately trying to wean itself off that dependency. Russia is using those gas stops as a political and economic weapon. That is why Germany is suddenly really embracing this idea of reducing the amount of electricity and energy it uses."
