Major leaks that suddenly erupted in the Nord Stream gas pipelines that run from Russia to Europe under the Baltic Sea have generated plenty of theories but few clear answers about who or what caused

洩漏原因尚不明確，歐美領導人表示這是一起蓄意破壞行為。相關猜測指向俄羅斯。分析認為破壞管道可能是烏克蘭戰爭開始以來一直在進行的能源代理戰爭的一次重大升級。

Western nations have said leaks in two Russian gas pipelines, Nord Stream 1 and 2, are likely the result of sabotage. Here's what you need to know about the controversial pipelines.