EXPLAINER: What's the fallout from Ukraine's pipe shutdown?

The shutdown of a gas pipeline through Russian-held territory in Ukraine is sending a new wave of energy jitters through Europe

The shutdown of a gas pipeline in eastern Ukraine has sent a fresh wave of energy jitters through Europe.

The price of gas jumped — then fell. The cutoff is in sharp focus because it's the first time that the war has disrupted the Russian natural gas that flows through Ukraine to get to Europe, where it powers factories and generates electricity.

Here are key things to know:

WHAT HAPPENED IN UKRAINE?