They provided silk
Hope this helped
As far as a threat, North Korea has been seen as such for many years (since WWII), when North Korea sided with Russia. America and its Capitalism were not fond of the Communist party, and so we have really been fighting/being concerned about Russian influence.
Historically North and South Korea have been in conflict many years before America and Russia got involved. When we did though it got worse.
Trump has done very little to resolve this, some would say he is making it worse.
AND as for any current events ask Google!
The answer is True.
Many people doubt it because it's just sound too fictional.
Ring of fire located in the basin of pacific ocean, a large number of earthquake and volcano eruptions happen here.
The island arc is a string of islands formed by volcanoes along deep ocean trench.
Hope it helps
