Natural gas stopped flowing through a pipeline that runs from Russia through Ukraine on Wednesday, according to officials in both countries. The effects of the halt, though long expected, could ripple through Europe’s energy sector and potentially affect Moscow’s ability to fund its war in Ukraine. Here’s what you need to know: What happened?Why did this happen now?What will it mean for Europe?The most affected countriesWhat happened? Ukraine refused to renew an agreement that allowed Russia to send natural gas through a pipeline to Europe. The deal was honored even after Russia invaded Ukraine in 2022, kicking off the bloodiest...