Putin threatens to cut off gas supplies to Europe if they do not pay in Rubles
"Nobody sells us anything for free, and we are not going to do charity either - that is, existing contracts will be stopped," Putin said
Eurostat: Russia is the EU’s largest supplier of natural gas
Russia is the EU's leading supplier of gas, oil, and coal
Greece says it can boost sunflower oil production, if needed
The government has asked suppliers, such as supermarkets and other food retailers, to declare stockpiles of certain products
