You are kidding, right? Why on earth would Russia blow up its own pipeline? And then why on earth would they try to repair it after it was blown up?
You are suffering from PDS (or RDS, or both).
If Russia wanted to take NS 2 out of action, all they had to do was turn a valve. The explosion does nothing to help Russia except preclude any possible future sales of gas using the pipelines.
OTOH, the USA had all the means and motive to carry out the sabotage, and President Biden promised to take out the pipelines in a press conference with Scholz in January.
The evidence is overwhelming.
Regarding the attack on the Kremlin, why would Russia stage a flag flag on itself when 70% of Russians already support the war effort? Do you honestly think Russia neeeded to get sympathy? Or do you purport to actually believe the Ukrainian poppycock about Russia wanting to "distract" from the Ukrainian counteroffensive which may or may not take place in the next 2 months?
Why was Zelensky hiding out in a reindeer stable in Finland when the attacks happened? Why was he being ferried around Europe, from one NATO hide-out to another, rather than manning his station in Kiev if the Kremlin incident was just meant as a "distraction" by Russia?
We already know that Ukraine has conducted terrorist attacks on Russian soil, and we know that the US had to persuade Ukraine NOT to attack Russia on the anniversary of the war.