Both of your statements are technically true (the cancelled pipeline was called South Stream).
Also true is that another pipeline called Balkan Stream connects to Turk Stream to transport the Russian gas into Bulgaria, Serbia, and Hungary, and went into operation in 2021.
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Turk Stream goes to Turkey, original plans to Bulgarian were canceled.
Both of your statements are technically true (the cancelled pipeline was called South Stream).
Also true is that another pipeline called Balkan Stream connects to Turk Stream to transport the Russian gas into Bulgaria, Serbia, and Hungary, and went into operation in 2021.
https://n1info.rs/english/news/balkan-stream-gas-pipeline-op...
That's right, South Stream. Thanks!