This is scary. What has dissuaded Putin from this kind of thing in the past (if anything)?
Keep in mind that Russia has a history of corrupting Western politicians, on a strategic and multi-decade basis, for example Gerhard Shroder, ex-Chancellor of Germany. He initiated the nuclear shutdown, and now serves as Chairman of Rosneft:
https://www.irishtimes.com/news/world/europe/gerhard-schr%C3...
The message to Europe is presumably: intervene in Ukraine this time, and we'll completely shut off your Winter gas.
Russia doesn't want to support the Ukraine with gas but it want to sell it to Europe.
Its basically the Molotov-Ribbentrop pact all over again.