I'm confused by that part too. It's almost like he was suggesting Ukraine should be "kicked out of NATO" but that sentence interpretation wouldn't make sense
The US trained and worked closely with Ukraine Special Ops. The odds of them not knowing what they were planning are slim to none. A high ranking Ukrainian official was the one who said Ukraine did it, but some how the president is claiming he didn't know..
So what I'm saying is, if the US knew and didn't say anything, if I'm part of NATO, I wouldn't trust anything this country says going forward. That pipeline is crucial. This war is really about oil/gas and who controls the flow of it going int Europe.

