Russia-Ukraine, what happens if Putin cuts gas supplies to Europe?

Diplomacy today tries to do its job, Russian and Ukrainian delegations meet in Paris, together with senior German and French officials: the goal is to avert the war escalation. And to this are added the threats from the United States and the United Kingdom, even heavier economic sanctions, some aimed directly at Vladimir Putin. The Russian president, for his part, denies that the Kremlin really intends to attack Ukraine and rather blames NATO for undermining security in the region.