North Korea appears to be making progress in developing a nuclear arsenal. On July 4, 2017, the state performed what appears to be its most advanced test in pursuit of a nuclear weapon to date, test-firing a missile that might be capable of reaching Alaska. It is unknown whether or not North Korea is capable of building a nuclear warhead that could survive a journey on a long-range missile and detonate successfully, but President Donald Trump is urging China to put more pressure on North Korea to end their nuclear threats.

July 5, 2017 video and resource materials from PBS NewsHour.