Tensions continue to rise between the two Koreas over the sinking of one of the south’s warships and the loss of 46 lives.
Both sides have raised their war-like rhetoric threatening conflict if the other side pushes too far.
South Korea’s President, Lee Myung-bak, attacked the North by announcing a suspension of trade.
He also banned North Korea’s cargo ships from passing through the south’s waters – a move aimed at crippling the impoverished regime as payback for the alleged torpedo strike.
The episode is one of the deadliest clashes between the two countries since the Korean War.
North Korea continues to deny responsibility and has warned any move to punish Pyongyang would mean war.
Few analysts believe either side would dare a full scale conflict.
But the escalating war or words risks developing into tit-for-tat skirmishes which could in turn grow into a wider conflict.