The shutdown of Russian gas transit through Ukrainian territory is one of Moscow's "most costly defeats," U.S. National Security Council spokesperson John Kirby said, as reported by Ukrinform on Jan.

This will clearly deprive Russia of about $6.5 billion in annual revenue from gas sales to Europe. It’s one of the biggest and most expensive losses for Moscow. Of course, we welcome Ukraine’s decision and its determination,

The historic first marks a milestone in Washington’s bid to replace Russia as Europe’s top source of natural gas.