Russia’s invasion into Ukraine one year ago led to concerns about the security of energy supplies, but U.S. LNG was up to the task, assuaging short-term widespread damage. The questions now are about how to prepare for winters to come, with additional gas export capacity possibly years away.

Pundits and analysts have weighed in on how the world has changed since Feb. 24, 2022, the day the unprovoked war began. Europe had begun a broad switch to transition from fossil fuels, but governments quickly made U-turns to secure supplies for their countries.

With domestic liquefied natural gas standing ready to move supplies to thirsty nations, U.S. and European experts are examining ways to cope in the long term. Wood Mackenzie Chair Simon Flowers on Wednesday shared insights about...