launches and alarming rhetoric. here's cbs' ramy inocencio. >> reporter: just hours after north korea launched two ballistic missiles banned by a u.n. resolution, south korea, not under u.n. missile restrictions, tested its own, a submarine-launched ballistic missile for the first time. seoul said it successfully hit its target. that led to a quick rebuke from the younger sister of kim jong- un. it's a notable rise in tensions after pyongyang's first-ever test of two cruise missiles last weekend. state media claimed they changed course mid-flight and did loops in the sky before hitting their targets more than 900 miles away. that could threaten japan and u.s. forces in the region. these launches, four in five days, come just after north korea celebrated the 73rd anniversary of its founding last thursday. kim jong-un appeared thinner and tanner than he did at the start