Since its nuclear test Monday, North Korea has issued a stream of harsh rhetoric, even declaring that the armistice that ended fighting in the Korean War is null and void.
Experts on North Korea say its tough talk is not unusual. Kim Tae-woo is the vice president of the Korea Institute for Defense Analysis in the South Korean capital, Seoul.
"This is very normal kind of language [for North Korea]," Kim said. " We already get used to that kind of practice."
However, he says North Korea does appear to be trying to provoke some sort of reaction from South Korea and other countries with its nuclear test.
The bitter divide between communist North Korea and democratic South Korea has left a legacy of military force on the peninsula. Kim says North Korea has long maintained one of the largest armies in the world - with more than one million active-duty troops.
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