Try putting satalites up to '3', it's almost impossible for an ICBM to get through.

Eventually just one did, but then even the volleys get stomped by the satalites.

This game has been running for over 10 minutes at DEFCON 1 for me, the blueside managed to get the first city down but it's now a city each but yellow also lost 2 of their triangles (bases? factories?).