In my opinion, it creates a big problem for EU. If Russia cannot sell gas for EU, they will earn less money but they still sell it, for example, Asia nations. In the side of EU, they are meeting the seriously scarcity of gas and food. They choose to decrease the gas in the WINTER.
In what way did the EU choose to reduce gas in winter? because gas has become a staple now even though it can still be tricked not to use it, but some people are also lazy if they have to replace gas with other materials for their every need. Basically all countries need gas and if the EU no longer accepts gas sales from the Russian side, then the Russian side can still market it to other continents besides Europe. Because gas will not be a waste as long as everyone still really needs it in everyday life.