When The Trump Administration pressured Foreign countries like Germany, France, China, India, Japan, and Russia into signing an agreement which asked them to choose between Iran and the United States, they all chose Iran.
Iran supports the Houthi rebels in Yemen. North Korea provides weapons to Yemen.
If you research further you will discover Yemen is one of the countries on Trumps ‘travel ban list’. It also is one of the only places where Democracy exists in the Arab World.
If The Trump Administration goes to War with North Korea, the possibility is that North Korea will strike South Korea or Japan.
Does the United States believe they can restrain North Korea from further missile or nuclear tests. When North Korea is allies with Iran?