On March 25, U.S. President Joe Biden said America will supply Europe with an extra 15 billion cubic meters of liquefied natural gas (LNG) this year, in a way to help reduce Europe's reliance on Russian gas. However, energy experts from around the world admit there're lots of constraints to achieve the task, thereby rendering Biden's promise as just something symbolic. Can the U.S. keep its gas supply promise to Europe? In this episode of BizBeat, CGTN's Zheng Junfeng explains.