Could be. But the implication was very strong that it was a ‘far away’ country or countries. At the moment, it could either be Qatar or the US, depending on who has the ability.
Another revelation that came to light was that there was a possible deal for gas supply to resume in exchange for Ukraine giving up 20% of its territory. This would give Ukraine a motive as well.
No good theories as to why Russia would sabotage their own pipeline when all they had to do was just turn a tap.