“Russia can sell all the gas it wants to other countries that have not sanctioned them”
Hope is not a plan of action.
The actual big projects that they had planned to expand their capacity to other markets, the Power of Siberia 2 pipeline, and the Arctic 2 LNG terminal; were not on track to go operational until 2030.
Both of those projects had their finances and partners pull out since the war.
It took decades to build the gas pipeline network to Europe. Replacement for gas customers is a long way away.
As is replacement gas for customers. A suicide pact. Not Europe's first.