WASHINGTON — All the elements of the North Korean nuclear crisis — the relentless drive by Kim Jong-un to assemble an arsenal, the propaganda and deception swirling around his progress, the hints of a covert war by the United States to undermine the effort, rather than be forced into open confrontation — were on vivid display this weekend.

There was the parade in Pyongyang’s main square, with wave after wave of missiles atop mobile launchers, intended to convey a sense that Mr. Kim’s program is unstoppable. Then came another embarrassing setback, a missile test that failed seconds after liftoff, the same pattern seen in a surprising number of launches since President Barack Obama ordered stepped-up cyber- and electronic-warfare attacks in early 2014. Finally, there was the test that did not happen, at least yet — a sixth nuclear explosion. It is primed and ready to go, satellite images show.

What is playing out, said Robert Litwak of the Woodrow Wilson International Center for Scholars, who tracks this potentially deadly interplay, is “the Cuban missile crisis in slow motion.” But the slow-motion part appears to be speeding up, as President Trump and his aides have made it clear that the United States will no longer tolerate the incremental advances that have moved Mr. Kim so close to his goals.

Secretary of State Rex W. Tillerson has said repeatedly that “our policy of strategic patience has ended,” hardening the American position as Mr. Kim makes steady progress toward two primary goals: shrinking a nuclear weapon to a size that can fit atop a long-range missile, and developing a hydrogen bomb, with up to a thousand times the power of the Hiroshima-style weapons he has built so far.