An image of the the "Hwasongpho-19" ICBM released by North Korean state media.KCNANorth Korea said it tested a new long-range intercontinental ballistic missile this week.State media called the "Hwasongpho-19" the "world's most powerful strategic missile."Experts say its size would likely affect its mobility in a conflict.North Korea said it tested the "world's most powerful strategic missile" earlier this week, but experts say its size may limit its effectiveness in a conflict.The intercontinental ballistic missile (ICBM) launched on Thursday and flew more than 1,000 km (around 620 miles) in around 86 minutes before landing in the Sea of Japan, the country's KCNA state news agency reported on Friday.