President Trump has dangerously misunderstood (or refused to understand) the security concern for the Nordstream gas pipelines directly connecting Germany to Russia via the Baltic Sea.
The issue is not that the pipelines render Germany dependent on Russian gas, as Trump stated. Russia is even more dependent on German money than the other way around. (more)
No, the problem with the pipelines is that they enable Russia to turn off gas to Baltic Republics, Poland, etc. WITHOUT pressuring Germay - thereby severing Alliance solidarity in a crisis
The US was concerned about the pipelines in order to uphold NATO solidarity vs Russian energy pressure. Since Trump has made clear he despises NATO, his remonstrances on pipeline can and will be shrugged off.
What he's performing this AM at NATO breakfast is a repeat of his 2016 "No puppet, you're the puppet" routine, accusing others of what is suspected of him: dependency on Russia, Putin. Does not fool anybody at the NATO table of course, but they're not the intended audience