On a clear day, residents on Yeonpyeong Island can see North Korea, only 10 kilometres away.<br/> <br />This South Korean border island is one of five, along the maritime frontier marking the two countries.<br/> <br />But the frontier is not recognised by North Korea, in fact it's not recognised internationally either.<br/> <br />That makes tensions especially high for the people living here.<br/> <br />On the beaches rows of anti-landing spikes and barbed wire fences frame the coast.<br/> <br />While long-range cruise missiles, capable of striking the North Korean capital of Pyongyang sit on the cliff-tops.<br/> <br />(SOUNDBITE) (Korean) HEAD OF YEONPYEONG ISLAND RESIDENTS' ASSOCIATION CHOI SUNG-IL SAYING:<br/> <br />"When I was little, the sound of artillery was like a lullaby to me. But since the 2010 bombing, every time I hear the sounds of gunfire or artillery during military exercises, I start to feel jittery."<br/> <br />North Korea warships and fishing boats routinely sail over the line, which has led to a spate of
