If we're lucky, it will be incompetent because the script writers have no idea how real life works.
If we are moderately lucky, such an AI will do this in a way that allows one random underdog to push a surprising oversized "stop" button with seconds to spare despite having previously demonstrated overwhelming force against a major nation's entire armed forces.
If we're extremely unlucky, it will be acting out a horror film with great competence.
If I had to bet on one of those three, I'd pick the first option — most scripts are not written by domain experts — but my main expectation outside this is "more of the same stuff we already see with corporations, but faster, and government regulation will continue to be 20 years behind the tech just like it is with the internet in general".