Maybe 7 years ago I borrowed a Sci-fi book about a supercomputer that was being researched to develop AI. I have since forgotten the title and author but want to reread it because I enjoyed it so much. Here is what I remember.
Researchers in a cold remote landscape are trying to develop AI. The facility is underground so that the supercomputer cannot access the outside world. The main researcher forgets about his cellphone and the AI then spreads to the outside world and is now able to control anything robotic (mostly self driving cars).
I think the book follows three different people in separate locations around the world. One is a Japanese or Chinese elderly man whose personal AI robot protects him from certain death. The other two are brothers, one with military background, and another individual but I can't recall.
I've searched using keywords and some descriptions above, but to no avail.