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It was Kremlin propaganda for a day to claim that the missiles that hit Poland were Ukrainian. People got flagged. Now it is the official Biden position.

I'm not sure why we in the West cannot adopt the following stance:

Yes, Russia invaded and committed atrocities. But it does not mean that everything they say is a lie. If you are familiar with Soviet propaganda, it is in fact relatively easy to spot the obvious lies (e.g., dirty bomb).

The Nord Stream sabotage is not at all obvious. The increased use of missiles started after the Crimea bridge attack. So they didn't need a false flag Nord Stream operation as an excuse for that.

Given that Biden has explicitly threatened to sabotage the NS2 pipeline, it's not I would say that the prime suspect has to be the USA. It's true that Russia would be the secondary suspect, just because of their quite erratic behavior.

But it is extremely important to note that Russia always had the option of simply stopping gas delivery even if the pipeline was not destroyed (and Germany similarly could stop delivery at the other end), while other parties had to actually sabotage the pipeline if they wanted to prevent such deals.