Alignment will be impossible. It is based on a premise that is a paradox itself. Furthermore, even if it were possible, there will be a hostile AI built on purpose because humanity is foolish enough to do it. Think military applications. I've written in detail about this topic FYI - https://dakara.substack.com/p/ai-singularity-the-hubris-trap
Stopping AI is also impossible. Nobody is going to agree to give up when somebody else out there will take the risk for potential advantage.
It seems we probably should start thinking more about defensive AI, as the above conditions don't seem resolvable. Of course, defensive AI might be futile as well. It is quite the dilemma.