Trump is correct in that we've been trying (with exception of the 0bama administration which was never "trying" anything), unsuccessfully, to negotiate with the N. Korean regime for 25 years and no progress has been made. I think Tillerson and the Trump administration are actually putting the screws to China so that China will put the screws to N. Korea, and the negotiation with N. Korea is a facade. Everyone knows negotiation with N. Korea will be fruitless.