2017–2018 North Korea crisis

In 2017, a crisis began when North Korea threatened the United States with a nuclear weapon. They began testing missiles, which proved that North Korea could attack the United States with a missile.
North Korea also threatened Australia with a nuclear weapon, saying that they were following the United States for no reason.
By 2018, the crisis had slowed down after North Korea went into talks with South Korea. They also agreed to take part in the 2018 Winter Olympics under one team for both Koreas. North Korea then began to stop doing nuclear tests. In September 2018, a summit between Kim Jong-un and Donald Trump happened in Singapore. North Korea agreed to stop making nuclear weapons.
Two other summits happened in 2019, but these did not go well and broke down.