That nordstream mission damaged the country that invaded Ukraine and was a wake up call for rather pro-russian Germany government (or more like pro-russian-gas at any cost), its rather a typical spec ops and they didn't even try very hard to cover it up. Plus highly logical and considered as one of possibilities right after the attack.

Why would Ukraine attack NATO member when they receive all the help and support from them? No logical reason I can think of.

From the WSJ article:

"Despite the war, Ukraine collects lucrative transit fees for Russian oil and gas estimated to be worth hundreds of millions of dollars a year."

So did Poland for a long time. No wonder they are against Nordstream, which circumvents the transit fees and the control.

Why would Ukraine do it? Both Ukraine and the U.S. have an interest in isolating Germany from Russia. If they did it, they might have thought that the investigation would not lead to them.

Reportedly, Ukraine also recently flew a Russian drone over a German power plant. Why does Ukraine continue with these proactive acts?

Do you have an archive link?

Not much incentive for Ukraine to hit Norway.