Head of the International Energy Agency, Fatih Birol, warns Russia may stop supplying gas to Europe this winter.
Mr 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.
Across Europe, shortfalls in gas supply continue to be reported.
In recent weeks several European countries said they received significantly less Russian gas than they expected.
Russian officials deny it’s deliberate and have blamed technical issues.
Before the invasion of Ukraine, Europe imported about 40% of its natural gas from Russia.
However, that figure has now fallen to about 20%.