In the light of increasing security threats, should countries still embrace the notion of a borderless world?

As many more countries are beginning to open up their
economies to welcome an increased flow of goods and services, people and even
ideas, the world is then becoming increasingly interconnected and
interdependent. The extent to which this process of globalisation is occurring
is so large that some have started to deem the world as borderless. With the
increased flow of things in the world, comes many advantages that many closed
economies would never once have imagined enjoying. But yet, there i...