I wonder if we can glean any information from the timing of this. Blind speculation follows... Was this a new system that has recently been set up, maybe even

I wonder if we can glean any information from the timing of this. Blind speculation follows... Was this a new system that has recently been set up, maybe even this week? If so, does that mean the US military is taking North Korea seriously and it's not just sabre-rattling? Do we have intel that North Korea is actually going to launch something towards us? Or is the US planning a first strike of their own in the very near future and are preparing for the inevitable counterattack?