This is an interesting discussion- assuming that Russia completely cuts its ties supplying gas to Europe, this would mean that there would be an increase of 65% in price of household energy.
1 With this kind of increase, countries would collapse and its economy would slowly crumble following this cutting of connection.
Though this might be the case, I am assuming that the world leaders are taking measures and contingencies to prevent this from happening. I guess they are slowly looking for alternatives at this stage as they are already accepting that Russia will soon do the inevitable.
1 https://www.goldmansachs.com/insights/pages/what-happens-if-russia-cuts-off-gas-to-europe-index.html