True. Mr. Vladimirovich doesn't want for any regime change that could just go back to selling natgas. I personally don't think it was UA either, although unlike so many other Kremlin claims, this would at least be a bit believable because there would be a motive.

But given that the pipe was already closed when it blew up, it most likely was FSB trying to frame Western powers and/or UA. Wouldn't be the first time FSB blows up Russian stuff to blame others.