The head of the International Energy Agency has warned that Russia may stop supplying gas to Europe this winter.
Fatih Birol says he believes a complete shutdown is not the most likely scenario but that Europe needs to work on contingency plans just in case.
Russian officials deny it's deliberate and has blamed technical issues.
Before the invasion of Ukraine, Europe imported about 40% of its natural gas from Russia but that figure has now fallen to about 20%.
Mr Birol says he believes that recent Russian reductions in gas supply are strategic.