(CNN) -- Another week, another North Korean provocation. It might seem an understandable reaction to news Monday that North and South Korea had exchanged hundreds of shells across their western sea border. The incident occurred a day after Pyongyang had warned it was preparing to test another nuclear device, and just a week after it tested two medium-range ballistic missiles. But should the West greet such saber-rattling with a shrug of the shoulders? After all, Western capitals have been engaging in this "dance" for two decades, since the late Kim Jong Il took over as the country's supreme leader. Is this latest round of provocations under his son and successor, Kim Jong Un, simply more of what we've seen before?
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Tensions flare again between North, South Korea
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Experts say West should pay attention to North Korea's saber-rattling
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Kim Jong Un is still young and his actions are difficult to predict, they say
They advised the @placeholder to remove ships from the area.