Russian credibility is at ~zero IMO. They've put forth so many insane theories related to this war that they started.
And just on first principles, how stupid would the Ukrainian have to be to do such a thing to their biggest ally? It almost beggars belief.
The Nord Stream destruction was made to Europe by their big friend Ukraine.
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Yes?
They would love to have a cause to involve anything NATO.
And for the first principles you are surely didn't miss: https://www.bbc.com/news/articles/cr7xzg3dmj8o