North Korea has done 6 nuclear tests including hydrogen bomb.
In April this year, Kim Jong had fired live in the sea. It was called North Korea's largest military exercise so far.
In two years North Korea has done 21 missile tests, four failed in it.
In six years, Kim Jong has conducted 43 short range, 13 medium, 10 cruises, 6 intercontinental missiles and 4 nautical tests.
North Korea has conducted 150 missile and nuclear tests in the past 33 years.
This year North Korea has done two tests of Intercontinental Ballistic Missile (ICBM) Hwasong-15. The range of this missile is 13 thousand kilometers. America has its limits too.
South Korea’s weather agency, the Korea Meteorological Administration, estimated Sunday that the nuclear blast yield of the presumed test was between 50 to 60 kilotons, or five to six times stronger than the North Korea’s fifth test in September 2016.