SEOUL, South Korea (AP) — North Korea fired a suspected intermediate-range ballistic missile into the sea on Sunday, South Korea's military said, two months after the North claimed to have tested engines for a new harder-to-detect missile capable of striking distant U.S. targets in the region. It said South Korea's military will maintain its readiness to overwhelmingly respond to any provocations by North Korea. The South Korean assessment suggests North Korea could have launched a new intermediate-range ballistic missile, whose solid-fuel engine it said it had tested in mid-November. North Korea has a growing arsenal of solid-fuel short-range missiles targeting South Korea, but its existing Hwasong-12 intermediate-range missile is powered by liquid-fuel engines. South Korea accused North Korea of continuing similar artillery barrage in the area for the next two days.