(CNN) North Korea has fired 12 missiles during nine tests in 2017. However, North Korea did not conduct any missile tests during the two months from Trump's election to his inauguration. Experts say with each test, North Korea can improve its missile technology. JUST WATCHED How the Kim dynasty has shaped North Korea Replay More Videos ... MUST WATCH How the Kim dynasty has shaped North Korea 01:25How close are they? JUST WATCHED North Korea claims it's close to testing an intercontinental ballistic missile Replay More Videos ... MUST WATCH North Korea claims it's close to testing an intercontinental ballistic missile 01:37That particularly opaque appraisal makes it hard to telegraph exactly how far away the country is from developing an intercontinental ballistic missile (ICBM), says John Delury, a professor at Seoul's Yonsei University's Graduate School of International Relations.

Source: CNN May 29, 2017 05:48 UTC