https://apnews.com/73b6635438481b6fbe9451dfea49699d > SEOUL, South Korea (AP) — A day after North Korea said it had performed a “very important test” at its long-range rocket launch site, there is wide speculation that it involved a new engine for either a space launch vehicle or a long-range missile. > Whatever it was, the North Korean announcement suggests that the country is preparing to do something to provoke the United States if Washington doesn’t back down and make concessions in deadlocked nuclear negotiations.