The spread of nuclear, biological, chemical and radiological weapons has a grave impact on global security but is only one side of the threat equation. To use or threaten to use a nuclear weapon, a country or a terrorist group needs to deliver it to its target. That's where ballistic missiles, cruise missiles, combat aircraft, drones and even trucks or ships come in.
Delivery systems determine how, when and against whom a country—or a non-state actor—can use these deadly and disruptive weapons.
What types of delivery systems exist?
The most common types of delivery systems for a country seeking the means for WMD delivery are ballistic and cruise missiles, combat aircraft (also known as "bombers") and unmanned aerial vehicles (also known as "drones"). Non-state actors may pursue cruder methods due to ease of access and opportunity.