I posted on this a few minutes ago:

This was in response to the North Korean nuclear test over the weekend.

The full White House statement :

I mentioned earlier that despite a lot of expectations that North Korean leader Kim Jong Un would not escalate much further, there is little sign of this ... a nuclear test is a big escalation.

Now the US is escalating with this rhetoric ... clearly stating

  • "commitment ... using ... nuclear capabilities"

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Earlier: