The era of strategic patience with the North Korean regime has failed. Many years, and it's failed. And, frankly, that patience is over.
If a North Korean ballistic missile can reach Alaska, it can reach Vladivostok.
The concern we should have is not that North Korea would suddenly launch a preemptive strike on Guam or any other target, but that the conflict escalates to the point that there is a miscalculation on one side or another and missiles or bombs are dropped.