Ukraine's move will deprive Russia of about $6.5 billion in annual revenue from gas sales to Europe, according to U.S. National Security Council spokesperson John Kirby.

With transit routes through Ukraine for Russian gas cut off, a few EU countries now need to rethink their gas supply. For others – including Germany and Switzerland – the impact will be minimal.

Slovak Prime Minister Robert Fico has expanded his threats against Ukraine over Kyiv's suspension of Russian natural gas transit. Source: Teraz.sk, citing Fico's words in Brussels after talks with European Commission officials on 9 January,

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

Ukraine’s decision to end the gas transit deal with Russian energy giant Gazprom has been hailed by President Volodymyr Zelensky as one of Moscow’s biggest defeats. Today, the transit of Russian gas is zero.

Ukrainian transit gas deal to Europe ended on Jan. 1. For now, the most acute effects are being felt in a region called Transnistria, on the eastern edge of Moldova.

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 ongoing conflict has highlighted the importance of diversifying gas supplies to build resilience against geopolitical risks.