Ukraine's continued strikes on fuel supplies to Crimea have sparked the worst fuel crisis on the Russian-held peninsula since it was illegally annexed by Russia in 2014.
Forecasters say there is a risk of a "very strong" El Nino, which typically leads to higher global temperatures and drought in some areas, but heavy rainfall in others.
Petrol stations in the Russian-held Crimea had run dry on Thursday, witnesses said, after Ukraine stepped up drone strikes on supply lines to the peninsula.