Was the Aleutian campaign only a Midway diversion?

Was Japan's Aleutian operation intended to lure American carriers north and draw the main Japanese fleet after them?

It had a diversionary role and also served Japan's effort to extend its defensive perimeter.

A diversion was one purpose of the Aleutian operation. Extending Japan's northern perimeter gave it an independent military purpose as well. The carrier-lure explanation captures part of the plan, while a single-motive account leaves out the northern objective.