Today, international security is facing threats from a 'devil's triangle' of arms capabilities, presented by offensive nuclear missiles, ballistic missile defence and outer space weaponization. These three are, and have been, inter-connected due to their technological and strategic natures. They are also the source of some of the most challenging diplomatic debates, particularly in today's tense geopolitical climate. Current events indicate that States are moving away from a position of restraint and towards accelerated development. This paper traces the roots of the relationship between missiles, missile defence and anti-satellite weapons to show where current trends might lead, and to offer some useful ideas on how to use diplomacy to find a new path for arms control.