If you are referring to NS2, no. It is pretty conclusive that it was Ukraine and the US had nothing to do with it. Germany identified the actors as Ukrainian citizen/military operating under an Ukrainian shell company. Also the US had made public half a year before that Ukraine had such plans and very strongly warned against it.

Parts of the Ukrainian intelligence apparatus and money showed some initiative and went through with it anyway. The point of NS was always to circumvent Ukraine for Russian oil exports and not really for additional capacity. The remaining capacity was never remotely maxed out, I think less than 30% or so and it was the Russians who blocked exports for a long time (Think of the repaired turbine story).