For the sake of america lets hop not.They will destroy us
Calling for anything less than a millitary (air) strike in retaliation for this agression against our ally does not get it.
We can't allow the lives of our allies anywhere to be taken by hostile action from an agressor nation.
We've made treaties with them, treaties that lay out our obligations to them and theirs to us. Just as we are bound to defend a NATO ally we are bound to defend them.
South Korea is our faithful ally. They sent the 2ndlargest contingent of troops to Vietnam to help us (a few divisions). South Korea was our ally in their own war. South Korea has been a shining example of the failure of the system in North Korea and it part of the reason that China is now a capitalist success story

NK can't stand it.
If we let this aggression pass with some soft words we will only look weak in the eyes of such aggressive nations (enemy and ally) and loose the influence we need to make peace in other places.