Interfax cites a statement by the US Secretary of Defense, speaking to journalists in the state of California:
America’s efforts are directed towards the diplomatic path, they are connected with diplomacy, there are diplomatic results, and we want to stay in that direction. The tragedy into which the war will pour out is well known, it makes no sense to describe it, suffice it to say that the consequences will be catastrophic.

When the Pentagon chief was asked whether the US was ready to strike at North Korea, Mattis, after a pause, hesitantly stated that “in principle, there is readiness,” and added that, as a US Secretary of Defense, it was primarily responsible for the consequences of such a blow.
Recall that earlier, US President Trump said that "you need to put the North Korean regime in place, for which to use all the available forces and means."