The North Koreans are now the ones ratcheting up the rhetoric. They say any provocative action by the South can be equated to war, and they would be ready to respond.
The announcement comes as a regional summit begins tomorrow. The Chinese are attending and their position vis-a-vis sanctions against North Korea are sure to dominate the conversations. Meanwhile, in Washington conversations about North Korea include one overarching theme -- is the U.S. policy of "strategic patience" a mistake?
There has been a history of North Korean aggression against the South, though the torpedoing of a South Korean warship two months ago came almost 15 years after the last attack.
And for what it is worth -- North Korea has used rocket or missile tests as a way to generate headlines in the U.S. as the country celebrates a national holiday. As you know, this weekend begins the long Memorial Day holiday.