You mean we don't know who managed to blow up the pipeline that some NATO members threatened to blow up several times? Yes, we only have this official investigation from two ""independent"" countries that wouldn't hesitate to point their finger at Russia if they had any evidence, no matter how weak, yet they closed it "without identifying perpetrators". You're right, no clue!
You can argue that if it was Russia, western countries might want to ignore it, because otherwise they'd have to do something.
Much easier to respond by supporting Ukraine.
For a NATO ally to do it would be extremely risky -- what if the others hadn't kept quiet?
(You can't always predict what your allies will do)
