Pending a brilliant one-line answer, here is a two-liner (It's a "two-liner" because it only works with two lines. Heh heh.)
Copy your circle and paste it in place. Set its stroke to 7 or 8 pts weight and assign the following custom dash. Select "None" for the "Corners" option (because each quarter of a circle is a 'corner', in InDesign's bezier curve based graphic model) and experiment with the Pattern Length to get a nice consistent distance.