Iceland is probably the most peaceful country in the world according to the 2015 Global Peace Index. Also, Iceland doesn’t share borders with other countries.
To be more specific Greenland is not politically aligned and too remote geographically.
Fiji is situated deep into the Pacific Ocean, which makes it very isolated from, potential invaders.
Chile is one of the most unwavering nation in South America and well protected by the Andes.
It`s unique location makes is a perfect safe haven in case of a WW3 apocalypse. Bhutan is also one of the most secluded landlocked countries in the world.