North Korea said Kim Jong Un oversaw a test of an intermediate-range hypersonic missile on Saturday. The launch came amid a standoff over a landmine blast, as Kim vowed to strengthen Pyongyang's war deterrent.

North Korea said it tested a strategic intermediate-range missile under Kim Jong Un's supervision. The launch deepened tensions after border mine blasts, with Seoul, Tokyo and Washington stepping up vigilance.

North Korea launched a ballistic missile Saturday morning from the Wonsan area on its east coast into the Sea of Japan, according to South Korea's military. The launch comes amid renewed tensions between…