I'm just wondering, are there any sovereign states anywhere in the world which do not maintain a military force of any type or size?
Military of Iceland
Iceland's defences consist of the Icelandic Coast Guard which patrols Icelandic waters and airspace and other services such as the National Commissioner's National Security and Special Forces Units.[1][2][3][4] Iceland is however the only NATO member which maintains no standing army, although there is no legal impediment to forming one and Icelandic services perform the operations fellow NATO allies relegate to their standing armies.
The Coast Guard consists of three ships and four aircraft and armed with small arms, naval artillery, and Air Defence weaponry.[5] The Coast Guard also maintains the Iceland Air Defence System, formerly part of the disestablished Defence Agency, which conducts ground surveillance of Iceland's air space.[5][6]
Units subordinated to the National Commissioner also take part in Iceland's defences. Foremost of these are the National Security Unit, which handles intelligence operations and the special unit Víkingasveitin, a highly trained and equipped counter terrorism unit which is part of the National Police force.
Additionally there is a Crisis Response Unit (ICRU), operated by the Ministry for Foreign affairs, which is a small peacekeeping force that has been deployed internationally, since 2008 performing duties unarmed unless under special circumstances..........