Ursula von der Leyen, President of the European Commission said they have spent weeks prior to this getting assurances from other countries to increase their gas deliveries. They named Azerbaijan, Egypt, Nigeria and Norway.
She said, they are now in a state, where they can't be pressured trough gas deliveries from Russia. Whether this is true, I have no idea.
Just passing on what was said, I don't have much knowledge on this topic. As I understood, they were implying importing more gas from other countries on existing infrastructure, not building entirely new one.
Looking at this, Russian LNG imports makes up 20%. Doesn't seem to be completly impossible for the other countries on that list to cover for it at maybe a higher price.
https://www.eia.gov/todayinenergy/detail.php?id=51358
It looks like Putin is making the correct calculation that the west would suffer more.
Look at the Chinese reaction, it is very unlikely he would be making this move without at least tacit Chinese support. He has an outlet for all of that energy and grain.
Yes, except now the Iranians also suddenly have significantly more leverage in negotiating a new treaty. Coming to a timely agreement there is not a foregone conclusion.
The key balance here is with the Iranians and the saudis. In all likelihood the nato response hinges on how much support they can count in the Middle East.