South Korean President calls Obama 's visit a ' strong message ' to the world . South Korea takes final step preparing for nuclear test . South Korean President delivers the message as President Obama arrives in Seoul . Capsizing of ferry that so far has housed 180 people , will overshadow his visit to S. Korea .
South Korean President calls Obama 's visit a 'strong message ' to the North . North Korea takes final step needed for nuclear test . South Korean official delivers the news as President Obama arrives in Seoul . Capsizing of ferry that so far has killed 180 people , will overshadow his visit to S. Korea .