It was seen as a way for Russia to prop up its currency and retaliate for Western sanctions, but it could cause global energy prices to spike. One analyst sees it as a warning to the rest of Europe.
A roundup of key developments and the latest in-depth coverage of Russia's invasion of Ukraine.
The governments of the two European countries said Russian energy giant Gazprom informed them it was halting gas supplies starting Wednesday.
This weekend would normally be a celebratory one for Ukrainians. But Easter Sunday marks two months since the latest Russian invasion. More than 40,000 refugees have found themselves in Bulgaria.