The White House described Ukraine's suspension of Russian gas transit as one of the most expensive defeats for Moscow, costing it around US$6.5 billion in revenue each year. Source: John Kirby, White House National Security Communications Advisor,

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 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.